Wright, Quincy
Institute of Pacific Relations, 1939
Buku Teks SO
Clyde, Paul Hibbert
Prentice-Hall, 1953
Buku Teks
Walker, Allan S.
Australian War Memorial, 1956
Buku Teks SO
Europe Publications Limited, 1992
Buku Referensi
Thompson, Warren S.
University od Chicago Press, 1959
Buku Teks SO