Lewis, Ralph G., author
St. Lucie Press, 1994
Buku Teks
Fandy Tjiptono, author
Andi Offset, 1996
Buku Teks
Gaspersz, Vincent, author
Gramedia Pustaka Utama, 1998
Buku Teks
by Dale H. Besterfield ... [and others]
Prentice-Hall, 1995
Buku Teks
Ritz, George J., author
New York: McGraw-Hill, 1990
Buku Teks