Thomas A. Carlson (ed.), "ʻDutra’" in last modified January 14, 2014, http://syriaca.org/place/2297
    
        
            
                
                    ʻDutra’
                    
                    http://syriaca.org/place/2297
                    
                        
              David Wilmshurst
            
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        312, 349