Thomas A. Carlson (ed.), "Derik" in last modified January 14, 2014, http://syriaca.org/place/814
    
        
            
                
                    Derik
                    
          
                    http://syriaca.org/place/814
                    http://en.wikipedia.org/wiki/Derik
                    http://dbpedia.org/resource/Derik
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
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