http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"Imperium Constantinopolitanum, Albania, Serbia, Bulgaria, Ruthenia, Ungaria, Polonia, Bohemia" - anno MCCCVIII exarata
ed., praef. et annotationibus instruxit Olgierd Górka.