Floyd, Kory, author
McGraw-Hill, 2015
Buku Teks
Gamble, Teri Kwal, author
Allyn and Bacon, 1994
Buku Teks
Devito, Joseph A., author
Harper and Row, 1984
Buku Teks
Payne, James, author
Illinois National Textbook, 1994
Buku Teks
Lucas, Stephen E., author
New York : McGraw-Hill, 1995,
Buku Teks