Thomas A. Carlson (ed.), "Billān" in last modified January 14, 2014, http://syriaca.org/place/1094
    
        
            
                
                    Billān
                    Barbellī
                    
                    
                        Shemkān district
                        ʿAmādīyā region
                    
          
                    http://syriaca.org/place/1094
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        133, 147, 152, 155, 156, 157