Lewis, Barry, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Feder, Kenneth L.
Mayfield Publishing Company, 1997
Buku Teks
Kennedy, William Jerald
West Publishing Company, 1977
Buku Teks
Jolly, Clifford J., author
McGraw-Hill, 1995
Buku Teks
Barnouw, Victor, author
Learning Syatems Company, 1973
Buku Teks