Townsley, W.A.
University of Queensland Press, 1976
Buku Teks
Robson, Lloyd
Oxford University Press , 1985
Buku Teks
Beatty, Bill
Cassell Australia, 1967
Buku Teks
Australian Government Publishing Service, 1988
Buku Teks
North, Alfred J.
Oxford University Press, 1984
Buku Referensi