Gray, Robert, author
Duffy and Snellgrove, 1996
Buku Teks
Callaghan, Barry
General Publishing Co. Limited, 1978
Buku Teks
Martin, Philip
Longman, 1988
Buku Teks
Roe, Frederick William
Harcourt, Brace and Company, 1928
Buku Teks
Kieran, John
Doubleday & Company, Inc., 1952
Buku Teks