Ansell, Rod
Currency Press,, 1986
Buku Teks
Bird, John, 1941-, author
Paul Elek, 1976
Buku Teks
Ryan, Neal, author
Prentice-Hall, 2003
Buku Teks
Sale, Colin, author
Australian Government Publishing Service, 1975
Buku Teks
Canbera: Australian Government Publishing service, 1980,
Buku Referensi