Seward, Linda, author
Reed Consumer Books, 1992
Buku Referensi
Webb, James, author
Bantam Books, 1985
Buku Teks
Cannon, Michael, author
Viking O`Neil, 1983
Buku Teks
Norden, Mary, author
Conran Octopus Limited, 2000
Buku Referensi
Idea Books, 1997
Buku Referensi