Thomas A. Carlson (ed.), "Erdil" in last modified January 14, 2014, http://syriaca.org/place/1200
    
        
            
                
                    Erdil
                    
                    
                        Zibār district
                        ʿAqrā region
                    
          
                    http://syriaca.org/place/1200
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        149, 154, 158, 163, 165