Thomas A. Carlson (ed.), "Balu" in last modified January 14, 2014, http://syriaca.org/place/1235
    
        
            
                
                    Balu
                    Bālū
                    
                    
                        Anzel district
                        Ūrmī region
                    
          
                    http://syriaca.org/place/1235
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        328, 329, 330, 331