Gaya APA

OKEY, R, O, R. (1982). Eastern europe 1740-1980: Feudalism to communism.-- (Cet.3.--). Amerika : University of minnesota press.

Gaya MLA

OKEY, Robin, OKEY,, Robin. "Eastern europe 1740-1980: Feudalism to communism.--". Cet.3.-- Amerika : University of minnesota press, 1982. Buku.