Baugh, W.E.
MacMillan Press, 1977
Buku Teks
Martin-Gay, K. Elayn, author
Prentice-Hall, 2001
Buku Teks
Martin-Gay, K. Elayn, author
Prentice-Hall, 2001
Buku Teks
Libraries Unlimited, 2004
Buku Teks
Kadish, Jules E., author
Artech House , 1993
Buku Teks