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
Wharton, Edith, author
Random House, 1994
Buku Teks