Levine, Stephen
Hutchinson of New Zealand, 1985
Buku Teks
King, Michael
Holder and Stroughton, 1988
Buku Teks
Cleave, Peter
Victory University Press, 1989
Buku Teks
Spoonley, Paul, author
Oxford University Press, 1990
Buku Teks
Hilliard, Noel, author
Heinemann, 1971
Buku Teks