Bŭlgarsko geologichesko druzhestvo. (1927). Spisanie na Bŭlgarskoto geologichesko druzhestvo =: Zeitschrift der Bulgarischen geologischen Gesellschaft. Pechatni︠t︡sa "Khudozhnik".
Chicago Style (17th ed.) CitationBŭlgarsko geologichesko druzhestvo. Spisanie Na Bŭlgarskoto Geologichesko Druzhestvo =: Zeitschrift Der Bulgarischen Geologischen Gesellschaft. Sofi︠i︡a: Pechatni︠t︡sa "Khudozhnik", 1927.
MLA (8th ed.) CitationBŭlgarsko geologichesko druzhestvo. Spisanie Na Bŭlgarskoto Geologichesko Druzhestvo =: Zeitschrift Der Bulgarischen Geologischen Gesellschaft. Pechatni︠t︡sa "Khudozhnik", 1927.
Warning: These citations may not always be 100% accurate.