Moline, Peg, author
Galvanized Brands, 2014
Buku Teks
Meredith, Sheena, author
Element , 1994
Buku Teks
Sambidge, Gordon, author
Piccadilly Press Ltd., 1992
Buku Referensi
Murray, Michael T., author
Riverhead Book, 2003
Buku Teks
Bove, Mary, author
Keats Publishing, 2001
Buku Teks