diff --git a/modules/core.xqm b/modules/core.xqm
index b8f84d41c..4d8fed2ce 100755
--- a/modules/core.xqm
+++ b/modules/core.xqm
@@ -80,12 +80,30 @@ declare %private function core:createColl($collName as xs:string, $cacheKey as x
 declare function core:undated($docType as xs:string) as document-node()* {
     switch($docType)
     case 'letters' case 'writings' case 'documents' return crud:data-collection($docType)/tei:TEI[ft:query(., 'date:undated')][not(tei:ref)]/root()
+    case 'sources' return 
+        crud:data-collection($docType)/tei:TEI[ft:query(., 'date:undated')][not(tei:ref)]/root() |
+        crud:data-collection($docType)/mei:manifestation[ft:query(., 'date:undated')]/root()
     default return ()
 };
 
+(:~
+ : Return a sequence of unique index values for a given field 
+ : defined in the Lucene index configuration.
+ :
+ : @see http://exist-db.org/exist/apps/doc/lucene#facets-and-fields
+ : @param $coll a collection of documents
+ : @param $field the index field name, e.g. "date"
+ : @return a sequence of index entries
+ :)
 declare function core:index-keys-for-field($coll as document-node()*, $field as xs:string) as xs:string* {
     distinct-values(
-        for $i in $coll/tei:TEI[ft:query(., (), map { "fields": $field })] | $coll/tei:ab[ft:query(., (), map { "fields": $field })] | $coll/tei:biblStruct[ft:query(., (), map { "fields": $field })]
+        for $i in 
+        (
+            $coll/tei:TEI[ft:query(., (), map { "fields": $field })] | 
+            $coll/tei:ab[ft:query(., (), map { "fields": $field })] | 
+            $coll/tei:biblStruct[ft:query(., (), map { "fields": $field })] |
+            $coll/mei:manifestation[ft:query(., (), map { "fields": $field })]
+        )
         return
             ft:field($i, $field)
     )
diff --git a/modules/search.xqm b/modules/search.xqm
index 94cdad189..049d24944 100644
--- a/modules/search.xqm
+++ b/modules/search.xqm
@@ -400,8 +400,10 @@ declare %private function search:facsimile-filter($collection as document-node()
 declare %private function search:get-earliest-date($coll as document-node()*, $docType as xs:string) as xs:string? {
     if(count($coll) gt 0) then 
         switch ($docType)
-        case 'news' case 'biblio' case 'letters' case 'writings' case 'diaries' case 'documents' return 
-            min(core:index-keys-for-field($coll, 'date')[not(.='undated')])
+        case 'news' case 'biblio' case 'letters' case 'writings' 
+            case 'diaries' case 'documents' case 'sources'
+            return 
+                min(core:index-keys-for-field($coll, 'date')[not(.='undated')])
         case 'persons' case 'orgs' return ()
         case 'works' return ()
         case 'places' return ()
@@ -415,8 +417,10 @@ declare %private function search:get-earliest-date($coll as document-node()*, $d
 declare %private function search:get-latest-date($coll as document-node()*, $docType as xs:string) as xs:string? {
     if(count($coll) gt 0) then 
         switch ($docType)
-        case 'news' case 'biblio' case 'letters' case 'writings' case 'diaries' case 'documents' return
-            max(core:index-keys-for-field($coll, 'date')[not(.='undated')])
+        case 'news' case 'biblio' case 'letters' case 'writings' 
+            case 'diaries' case 'documents' case 'sources'
+            return
+                max(core:index-keys-for-field($coll, 'date')[not(.='undated')])
         case 'persons' case 'orgs' return ()
         case 'works' return ()
         case 'places' return ()
diff --git a/modules/wdt.xqm b/modules/wdt.xqm
index eb4f6c7c4..1d0ef7e3c 100644
--- a/modules/wdt.xqm
+++ b/modules/wdt.xqm
@@ -759,7 +759,7 @@ declare function wdt:sources($item as item()*) as map(*) {
             else ()
         },
         'filter-by-date' : function($dateFrom as xs:date?, $dateTo as xs:date?) as document-node()* {
-            () 
+            $wdt:filter-by-date($item, $dateFrom, $dateTo)[parent::tei:imprint or parent::tei:creation or parent::mei:pubStmt or parent::mei:creation]/root()
         },
         'sort' : function($params as map(*)?) as document-node()* {
             if(sort:has-index('sources')) then ()
diff --git a/templates/ajax/sources.html b/templates/ajax/sources.html
index db66aaa7f..608c8740d 100644
--- a/templates/ajax/sources.html
+++ b/templates/ajax/sources.html
@@ -3,7 +3,8 @@
         <h2><a href="#allFilter" class="collapseSingle" aria-expanded="true" data-toggle="collapse"><span data-template="lang:translate">filter</span></a></h2>
         <!-- Facetten Filter-->
         <div class="allFilter panel-collapse collapse show" id="allFilter">
-            <!--            <h4 data-template="lang:translate">chronology</h4>-->
+            <h4 data-template="lang:translate">chronology</h4>
+            <input type="text" class="rangeSlider" name="chronology-slider" data-template="app:set-slider-range"/>
             
             <h4 data-template="lang:translate">sources-meta-cat</h4>
             <select multiple="multiple" data-template="facets:select" name="sources-meta-cat"/>