Thompson, Warren S.
The University of Chicago Press, 1968
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
Latourette, Kenneth Scott
Macmillan, 1957
Buku Teks SO