Miller, Judith, author
Reed International Books Limited, 1992
Buku Referensi
Crump, Derrick, author
Aquantum Book, 1992
Buku Referensi
Crump, Derrick
Chancellor Press , 1999
Buku Referensi
Dean, Yvonne
Mitchel, 1989
Buku Teks
A Ward Lock Book, 1997
Buku Referensi