Thomas A. Carlson (ed.), "Walṭo" in last modified January 14, 2014, http://syriaca.org/place/792
    
        
            
                
                    Walṭo
                    Walto
                    Walṭō
                    
                    
                        Hakkārī region
                    
          
                    http://syriaca.org/place/792
                    
                        The Gorgias Encyclopedic Dictionary of the Syriac Heritage
                        
                        186
                    
                    
                        David Wilmshurst
                        The Ecclesiastical Organisation of the Church of the East, 1318-1913
                        279, 285, 286, 287, 291-292, 357, 366