Thomas A. Carlson (ed.), "Birta" in last modified January 14, 2014, http://syriaca.org/place/1233
    
        
            
                
                    Birta
                    Birtā
                    
                    
                        Shemkān district
                        ʿAmādīyā region
                    
          
                    http://syriaca.org/place/1233
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        131, 133, 145, 156, 157