Westerfield, Ray B.
Money, credit and banking
Roland Press , 1947
 Buku Teks
Brown, J. F.
The New Eastern Europe
Frederick A. Preager, 1966
 Buku Teks
Central and Eastern Europe
Westview Press, 1989
 Buku Teks
Central and Eastern Europe
Westview Press, 1989
 Buku Teks
The U.S.S.R. and eastern Europe Prepared
by the Economist Intelligence Unit and the Cartographic Dept. of the Clarendon Press
Oxford University Press, 1956
 Buku Referensi