Crowley, James B., author
Princeton University Press, 1966
Buku Teks
Bisson, T.A., author
The Foreign Policy Association , 1941
Buku Teks
Joseph, Phillip, author
George Allen and Unwin, 1928
Buku Teks
Quigley, Harold S., author
World Peace Foundation, 1938
Buku Teks
Adcock, Sir Frank
Thames and Hudson, 1975
Buku Teks