Weale, Putnam
Macmillan, 1997
Buku Teks
Clyde, Paul Hibbert
Prentice-Hall, 1953
Buku Teks
Walker, Allan S.
Australian War Memorial, 1956
Buku Teks
Thompson, Warren S.
The University of Chicago Press, 1959
Buku Teks
Latourette, Kenneth Scott
Macmillan, 1957
Buku Teks