Westerfield, Ray B.
Money, credit and banking
Roland Press , 1947
Buku Teks
Gyeszly, Suzanne D.
Eastern Europe : A resource guide
The Borgo Press, 1994
Buku Referensi
Brown, J. F.
The New Eastern Europe
Frederick A. Preager, 1966
Buku Teks SO
Central and Eastern Europe
Westview Press, 1989
Buku Teks
Central and Eastern Europe
Westview Press, 1989
Buku Teks