Seton-Watson, Hugh, author
Methuen , 1950
Buku Teks
Seton-Watson, Hugh, author
Frederick A. Praeger, 1962
Buku Teks
Bugajski, Janusz, author
Westview Press, 1989
Buku Teks
edited by Stephen White, Judy Batt and Paul G. Lewiss
Macmillan, 1993
Buku Teks
Diez-Hochleitner, Ricardo, author
I.B. Tauris, 2008
Buku Teks