Tedford, Thomas L.
McGraw-Hill, 1991
Buku Teks
Gamble, Teri Kwal, author
Allyn and Bacon, 1994
Buku Teks
Payne, James, author
Illinois National Textbook, 1994
Buku Teks
Lucas, Stephen E., author
New York : McGraw-Hill, 1995,
Buku Teks
Lucas, Stephen E., author
McGraw-Hill , 2004
Buku Teks