Nathan P. Gibson (eds.), "Digital Vatican Library" in Digital Vatican Library last modified June 20, 2017, http://syriaca.org/bibl/2497
    
        
            
                
                    Digital Vatican Library
                    http://syriaca.org/bibl/2497
                    1063
                    http://zotero.org/groups/392292/items/6XJFBWHX
                    
                        http://digi.vatlib.it/