Prewitt, Bobby Ward
Hawker Bronlow Education, 1994
Buku Teks
Bueno, Patricia
Atrium Group, 2003
Buku Teks
Postell, Jim, author
John Wiley & Sons, 2007
Buku Teks
Aronson, Joseph, author
Clarkson Potter, 1965
Buku Referensi
Idea Books, 1997
Buku Referensi