Hughes, Colin A.
Australian National University Press, 1968
Buku Teks
Crisp, L. F. (Leslie Finlay)
Longman Chesire, 1965
Buku Teks
Sawer, Geoffrey, 1910-1996
Melbourne University Press, 1973
Buku Teks
Huges, Colin Anfield
Oxford University Press, 1976
Buku Teks
Edward Arnold, 1978
Buku Teks