Berkowitz, Eric N.
Jones & Bartlett Learning, 2017
Buku Teks
Kotler, Philip
Prentice-Hall, 1987
Buku Teks
Fortenberry, John L., Jr.
Jones & Bartlett Learning, 2011
Buku Teks
edited by Charles D. Schewe
Haworth Press, 1991
Buku Teks
Hillestad, Steven G.
An Aspen Publication, 1991
Buku Teks