Hillestad, Steven G.
An Aspen Publication, 1991
Buku Teks
Hillestad, Steven G., author
Jones & Bartlett Learning, 2013
Buku Teks
MacStravic, Robin E., author
Aspen Publication, 1977
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1987
Buku Teks
edited by Charles D. Schewe
Haworth Press, 1991
Buku Teks