Ellem, Bradon, author
New South Wales University Press, 1989
Buku Teks
Sutcliffe, J.T., author
Macmillan, 1967
Buku Teks
Turner, Ian, author
Nelson, 1976
Buku Teks
Ross, Robert, author
Polity Press, 2008
Buku Teks
edited by Gordon Greenwood
Angus and Robertson, 1969
Buku Teks