Brown, J. F.
The New Eastern Europe
Frederick A. Preager, 1966
Buku Teks SO
Brabandere, Luc de
Thinking in new boxes : a new paradigm for business creativity
Random House, 2013
Buku Teks SO
Gyeszly, Suzanne D.
Eastern Europe : A resource guide
The Borgo Press, 1994
Buku Referensi
Central and Eastern Europe
Westview Press, 1989
Buku Teks
Central and Eastern Europe
Westview Press, 1989
Buku Teks