Grey, Jeffrey
Cambridge University Press, 1990
Buku Teks
Reshetar, John S.
Frederick A. Praeger, 1962
Buku Teks
Sale, Colin, author
Australian Government Publishing Service, 1975
Buku Teks
edited by G.L. Wood
Macmillan, 1954
Buku Teks
Blainey, Geoffrey, 1930-, author
Sun Books, 1980
Buku Teks