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