Howell, Rate A., author
Dryden Press, 1984
Buku Teks
Brett, Peter, author
Butterworth, 1989
Buku Teks
Brett, Peter, author
Butterworth, 1971
Buku Teks
Knowles, George S., author
L. F Johnston Commonwealth Government, 1936
Buku Teks
Sawer, Geoffrey, 1910-1996, author
Penguin Books, 1973
Buku Teks