Thomas A. Carlson (ed.), "Ṭirhan" in last modified January 14, 2014, http://syriaca.org/place/789
    
        
            
                
                    Ṭirhan
                    Ṭirhān
                    
                    
                        Kirkūk region
                    
          
                    http://syriaca.org/place/789
                    http://en.wikipedia.org/wiki/Tirhan_(East_Syrian_Diocese)
                    
                        The Gorgias Encyclopedic Dictionary of the Syriac Heritage
                        
                        54, 141, 370
                    
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        19, 127, 175, 177, 346