Moffitt, Ian, author
Collins, 1982
Buku Teks
Ford, John, author
Harper and Row, 1981
Buku Teks
Palmer, Vance, author
University of Queensland, 1972
Buku Teks
Ireland, David, author
Angus and Roberson Publishers, 1983
Buku Teks
Ireland, David, author
Macmillan, 1976
Buku Teks