http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
International Congress on Bulgarian Studies 1981 : Sofia, Bulgaria)
Pŭrvi Mezhdunaroden kongres po bŭlgaristika, Sofii︠a︡ 23 maĭ-3 i︠u︡ni 1981 ; [redakt︠s︡ii︠a︡ Krŭmka Sharova, Mikhail Bŭchvarov].
Bulgarian, English, French, and Russian.