J. M. Fiey, Jeanne-Nicole Mellon Saint-Laurent and David A. Michelson, (eds.), "Portraits of spiritual authority : religious power in early Christianity, Byzantium, and the Christian Orient" in last modified August 3, 2016, http://syriaca.org/bibl/2266
    
        
            
                
                    
                        Jan Willem
                        Drijvers
                    
                    
                        J. W.
                        Watt
                    
                    Portraits of spiritual authority : religious power in early
                Christianity, Byzantium, and the Christian Orient
                    http://syriaca.org/bibl/2266
                    828
                    http://zotero.org/groups/392292/items/EE4SKXEJ
                    90-04-11459-9
                    978-90-04-11459-3
                
                
                    
                        Brill
                        1999