Hough, Jerry F.
The Brookings Institution, 1980
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
Gregory, James S., author
Penguin Books, 1946
Buku Teks
edited by Alexander Dalllin, Gail W. Lapidus
Westview press, 1991
Buku Teks
Brezhnev, L. I.
Progress, 1975
Buku Teks