diff --git a/csl/chicago-author-date-de.csl b/csl/chicago-author-date-de.csl
deleted file mode 100644
index 405bfce26b..0000000000
--- a/csl/chicago-author-date-de.csl
+++ /dev/null
@@ -1,404 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<?oxygen RNGSchema="http://xbiblio.svn.sourceforge.net/viewvc/*checkout*/xbiblio/csl/schema/trunk/csl.rnc" type="compact"?>
-<style xmlns="http://purl.org/net/xbiblio/csl" xml:lang="en" class="in-text" >
-  <info>
-    <title>Chicago Manual of Style (Author-Date format) - DE</title>
-    <id>http://www.zotero.org/styles/chicago-author-date-de</id>
-    <link href="http://www.zotero.org/styles/chicago-author-date-de"/>
-    <author>
-      <name>Julian Onions</name>
-      <email>julian.onions@gmail.com</email>
-    </author>
-    <contributor>
-      <name>Peter Baumgartner</name>
-      <email>peter.baumgartner@donau-uni.ac.at</email>
-    </contributor>
-    <category term="author-date"/>
-    <category term="generic-base"/>
-    <updated />
-    <link href="http://www.chicagomanualofstyle.org/tools_citationguide.html" rel="documentation"/>
-    <summary>The author-date variant of the Chicago style adapted for German. I addition to the online reference I've used:
-      Turabian, K. L. (2007). A Manual for Writers of Research Papers, Theses, and Dissertations. Chicago Style for Students and Researchers. University Of Chicago Press.
-      Especially figure 18.1 pp 218-220 
-      NOTE: check all the details and special cases of chapter 19: "Parethetical Citations-Reference List Style: Citing Specific Types of Sources
-      I used as template the Chicago Manual of Style (Author-Date) Revision 3195
-      Code changes to adapt for a valid German version:
-      * replaced delimiter-precedes-last="always" with "never" to get rid of the last comma in author names
-      * added colon as suffix of the term "in".
-      * added colon as suffix of the termin "accessed".
-      * changed variable "issue" of "article-journal from "no." to "Nr."
-      I also changed some script logic which in noted in the code:
-      * do not add day-month at the end of a book, even it is provided in the date field of the zotero database (as it sometimes come from amazon)
-      * added access date for material with URL.
-      * not all archive items should end with a fullstop. A doi is followed by a comma and space, a URL just by a space before the date comes.
-        NOTE: this should be checked more in detail 
-      * if there is just a secondary contributor (e.g. editor of a book) then this is the primary contributor and the generated output should not repeat the name as secondary contributor. 
-    </summary>
-  </info>
-  
-  <macro name="secondary-contributors">
-    <choose>
-      <if type="chapter" match="none">
-    <group delimiter=". ">
-      <names variable="editor">
-        <label form="verb-short" prefix=" " text-case="capitalize-first" suffix=". "/>
-        <name and="text" delimiter=", "/>
-      </names>
-      <choose>
-        <if variable="author editor" match="any">
-          <names variable="translator">
-            <label form="verb-short" prefix=" " text-case="capitalize-first" suffix=". "/>
-            <name and="text" delimiter=", " />
-          </names>
-        </if>
-      </choose>
-    </group>
-      </if>
-    </choose>
-  </macro>
-  <macro name="container-contributors">
-    <choose>
-      <if type="chapter">
-    <group prefix="," delimiter=", ">
-      <names variable="editor">
-        <label form="verb-short" prefix=" " text-case="lowercase" suffix=". "/>
-        <name and="text" delimiter=", "/>
-      </names>
-      <choose>
-        <if variable="author editor" match="any">
-          <names variable="translator">
-            <label form="verb-short" prefix=" " text-case="lowercase" suffix=". "/>
-            <name and="text" delimiter=", "/>
-          </names>
-        </if>
-      </choose>
-    </group>
-      </if>
-    </choose>
-  </macro>
-  <macro name="anon">
-    <choose>
-      <if variable="author editor translator" match="none">
-    <text term="anonymous" form="short" text-case="capitalize-first"/>
-	  </if>
-	</choose>
-  </macro>
-  <macro name="editor">
-    <names variable="editor">
-      <name name-as-sort-order="first" and="text" sort-separator=", " delimiter=", " delimiter-precedes-last="never"/>
-      <label form="short" prefix=", " suffix="."/>
-    </names>
-  </macro>
-  <macro name="translator">
-    <names variable="translator">
-      <name name-as-sort-order="first" and="text" sort-separator=", " delimiter=", " delimiter-precedes-last="never"/>
-      <label form="verb-short" prefix=", " suffix="."/>
-    </names>
-  </macro>
-  <macro name="recipient">
-    <choose>
-      <if type="personal_communication">
-    	<choose>
-	  	  <if variable="genre">
-		<text variable="genre" text-case="capitalize-first"/>
-	  	  </if>
-	  	  <else>
-		<text term="letter" text-case="capitalize-first"/>
-		  </else>
-	    </choose>
-	  </if>
-	</choose>
-    <names variable="recipient" delimiter=", ">
-      <label form="verb" prefix=" " text-case="lowercase" suffix=" "/>
-      <name and="text" delimiter=", "/>
-    </names>
-  </macro>
-  <macro name="contributors">
-    <names variable="author">
-      <name and="text" name-as-sort-order="first" sort-separator=", " delimiter=", "
-        delimiter-precedes-last="never"/>
-      <label form="verb-short" prefix=", " suffix="." text-case="lowercase"/>
-      <substitute>
-        <text macro="editor"/>
-        <text macro="translator"/>
-      </substitute>
-    </names>
-    <text macro="anon"/>
-    <text macro="recipient"/>
-  </macro>
-  <macro name="contributors-short">
-    <names variable="author">
-      <name form="short" and="text" delimiter=", " delimiter-precedes-last="never"/>
-      <substitute>
-        <names variable="editor"/>
-        <names variable="translator"/>
-      </substitute>
-    </names>
-    <text macro="anon"/>
-  </macro>
-  <macro name="interviewer">
-    <names variable="interviewer" delimiter=", ">
-      <label form="verb" prefix=" " text-case="capitalize-first" suffix=" "/>
-      <name and="text" delimiter=", "/>
-    </names>
-  </macro>
-  <macro name="archive">
-    <group delimiter=". ">
-      <text variable="archive_location" text-case="capitalize-first"/>
-      <text variable="archive"/>
-      <text variable="archive-place"/>
-     </group>
-  </macro>
-  <macro name="access">
-    <group delimiter=". ">
-	  <choose>
-	    <if type="graphic report" match="any">
-      <text macro="archive"/>
-	    </if>
-	    <else-if type="book thesis chapter article-journal article-newspaper article-magazine" match="none">
-      <text macro="archive"/>
-	    </else-if>
-	  </choose>
-    </group> <!-- not all items of archive should end with a fullstop. I've transfered end of the delimiter="." group at this place  -->
-      <text variable="DOI" prefix="doi:" suffix=", "/> 
-      <text variable="URL"/>
-      <!-- added date for material on the web -->
-      <group prefix=" (" suffix=")">
-        <text term="accessed" text-case="capitalize-first" suffix=": "/>
-        <date variable="accessed">
-          <date-part name="day" suffix=". "/>
-          <date-part name="month" suffix=" "/>
-          <date-part name="year"/>
-        </date>
-      </group>
-   
-  </macro>
-  <macro name="title">
-    <choose>
-      <if variable="title" match="none">
-        <choose>
-          <if type="personal_communication" match="none">
-        <text variable="genre" text-case="capitalize-first"/>
-          </if>
-        </choose>
-      </if>
-      <else-if type="book">
-        <text variable="title" font-style="italic"/>
-      </else-if>
-      <else>
-        <text variable="title"/>
-      </else>
-    </choose>
-  </macro>
-  <macro name="edition">
-    <choose>
-      <if type="book chapter" match="any">
-    <choose>
-      <if is-numeric="edition">
-        <group delimiter=" ">
-          <number variable="edition" form="ordinal"/>
-          <text term="edition" form="short" suffix="."/>
-        </group>
-      </if>
-      <else>
-        <text variable="edition" suffix="."/>
-      </else>
-    </choose>
-      </if>
-    </choose>
-  </macro>
-  <macro name="locators">
-    <choose>
-      <if type="article-journal">
-        <text variable="volume" prefix=" "/>
-        <text variable="issue" prefix=", Nr. "/>
-      </if>
-      <else-if type="book">
-        <group prefix=". " delimiter=". ">
-          <group>
-            <text term="volume" form="short" text-case="capitalize-first" suffix=". "/>
-            <number variable="volume" form="numeric"/>
-          </group>
-          <group>
-            <number variable="number-of-volumes" form="numeric"/>
-            <text term="volume" form="short" prefix=" " suffix="." plural="true"/>
-          </group>
-        </group>
-      </else-if>
-    </choose>
-  </macro>
-  <macro name="locators-chapter">
-    <choose>
-      <if type="chapter">
-        <group prefix=", ">
-          <text variable="volume" suffix=":"/>
-          <text variable="page"/>
-        </group>
-      </if>
-    </choose>
-  </macro>
-  <macro name="locators-article">
-    <choose>
-      <if type="article-newspaper">
-        <group prefix=", " delimiter=", ">
-          <group>
-        <text variable="edition" suffix=" "/>
-        <text term="edition" prefix=" "/>
-          </group>
-          <group>
-        <text term="section" form="short" suffix=". "/>
-        <text variable="section"/>
-          </group>
-        </group>
-      </if>
-      <else-if type="article-journal">
-    <text variable="page" prefix=": "/>
-      </else-if>
-    </choose>
-  </macro>
-  <macro name="point-locators">
-    <group>
-      <choose>
-	    <if locator="page" match="none">
-	  <label variable="locator" form="short" include-period="true" suffix=" "/>
-	    </if>
-	  </choose>
-      <text variable="locator"/>
-	</group>
-  </macro>
-  <macro name="container-prefix">
-    <text term="in" text-case="capitalize-first" suffix=":"/>
-  </macro>
-  <macro name="container-title">
-    <choose>
-      <if type="chapter">
-        <text macro="container-prefix" suffix=" "/>
-      </if>
-    </choose>
-    <text variable="container-title" font-style="italic"/>
-  </macro>
-  <macro name="publisher">
-    <group delimiter=": ">
-      <text variable="publisher-place"/>
-      <text variable="publisher"/>
-    </group>
-  </macro>
-  <macro name="date">
-    <date variable="issued">
-      <date-part name="year"/>
-    </date>
-  </macro>
-  <macro name="day-month">
-    <date variable="issued">
-      <date-part name="month"/>
-      <date-part name="day" prefix=" "/>
-    </date>
-  </macro>
-  <macro name="collection-title">
-    <text variable="collection-title"/>
-    <text variable="collection-number" prefix=" "/>
-  </macro>
-  <macro name="event">
-    <group>
-      <text term="presented at" suffix=" "/>
-      <text variable="event"/>
-    </group>
-  </macro>
-  <macro name="description">
-    <group delimiter=". ">
-      <text macro="interviewer"/>
-      <text variable="medium" text-case="capitalize-first"/>
-    </group>
-    <choose>
-      <if variable="title" match="none"> </if>
-      <else-if type="thesis"> </else-if>
-      <else>
-        <text variable="genre" text-case="capitalize-first" prefix=". "/>
-      </else>
-    </choose>
-  </macro>
-  <macro name="issue">
-    <choose>
-      <if type="article-journal">
-        <text macro="day-month" prefix=" (" suffix=")"/>
-      </if>
-      <else-if type="speech">
-        <group prefix=" " delimiter=", ">
-          <text macro="event"/>
-          <text macro="day-month"/>
-          <text variable="event-place"/>
-        </group>
-      </else-if>
-      <else-if type="article-newspaper article-magazine" match="any">
-        <text macro="day-month" prefix=", "/>
-      </else-if>
-      <!-- do not add day-month at the end of a book, even it is provided in the date field of the zotero database (as it sometimes come from amazon) -->
-      <else-if type="book">
-        <text macro="publisher" prefix=". " />
-      </else-if>
-      <else>
-        <group prefix=". " delimiter=", ">
-          <choose>
-            <if type="thesis">
-              <text variable="genre" text-case="capitalize-first"/>
-            </if>
-          </choose>
-          <text macro="publisher"/>
-          <text macro="day-month"/>
-        </group>
-      </else>
-    </choose>
-  </macro>
-  <citation>
-    <option name="et-al-min" value="4"/>
-    <option name="et-al-use-first" value="1"/>
-    <option name="et-al-subsequent-min" value="4"/>
-    <option name="et-al-subsequent-use-first" value="1"/>
-    <option name="disambiguate-add-year-suffix" value="true"/>
-    <option name="disambiguate-add-names" value="true"/>
-    <option name="disambiguate-add-givenname" value="true"/>
-    <layout prefix="(" suffix=")" delimiter="; ">
-      <group delimiter=", ">
-        <group delimiter=" ">
-          <text macro="contributors-short" />
-          <text macro="date"/>
-        </group>
-        <text macro="point-locators"/>
-      </group>
-    </layout>
-  </citation>
-  <bibliography>
-    <option name="hanging-indent" value="true"/>
-    <option name="et-al-min" value="11"/>
-    <option name="et-al-use-first" value="7"/>
-    <option name="subsequent-author-substitute" value="---"/>
-    <option name="entry-spacing" value="0"/>
-    <sort>
-      <key macro="contributors"/>
-      <key variable="issued"/>
-    </sort>
-    <layout suffix=".">
-      <text macro="contributors" suffix=". "/>
-      <text macro="date" suffix=". "/>
-      <text macro="title"/>
-      <text macro="description"/>
-      <!-- if there are only secondary-contributors then do no repeat secondary contributors 
-      I know this code should be somewhere in the macro part of the file but I couldn't find the right place 
-      Help will be appreciated -->
-      <choose> 
-        <if variable="author" match="any">
-            <text macro="secondary-contributors" prefix=". "/>
-          </if>
-      </choose> 
-      <text macro="container-title" prefix=". "/>
-      <text macro="container-contributors"/>
-      <text macro="locators-chapter"/>
-      <text macro="edition" prefix=". "/>
-      <text macro="locators"/>
-      <text macro="collection-title" prefix=". "/>
-      <text macro="issue"/>
-      <text macro="locators-article"/>
-      <text macro="access" prefix=". "/>
-    </layout>
-  </bibliography>
-</style>