Kaplan, Robert D., author
Random House, 2000
Buku Teks
Kaplan, Robert D., author
Caroline Cunningham, 2000
Buku Teks
Wolff, Robert Lee, author
Harvard University Press, 1956
Buku Teks
Roosevelt, Kermit
Buku Teks
Stoyan, P. B.
Foreign Policy Association, 1940
Buku Teks