Thomas A. Carlson (ed.), "Ūlā" in last modified January 14, 2014, http://syriaca.org/place/1798
    
        
            
                
                    Ūlā
                    
                    
                        Salmas district
                        Ūrmī region
                    
          
                    http://syriaca.org/place/1798
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        322, 326, 327-328, 329, 330