Hoskins, Janet, author
Routledge, 1998
Buku Teks
Schwartz, Alvin, author
Harper Trophy, 1981
Buku Teks
Schwartz, Alvin, author
Harper Trophy, 1984
Buku Teks
Liswood, Laura A., author
Pandora, 1995
Buku Referensi
Barrett, John, author
Allen & Unwin, 1995
Buku Teks