Borkenau, Franz
Harper & Brothers , 1953
Buku Teks
Plamenatz, John
National News-Letter, 1949
Buku Teks
Lenin, Vladimir I., author
Foreign Languages Publishing House, 1963
Buku Teks
edited by Chong-Shik Chung and Gahb-Chol Kim
Research center for peace and unification, 1980
Buku Teks
Houn, Franklin W.
Prenrice-Hall , 1973
Buku Teks