Berkowitz, Eric N., author
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Buku Teks
MacStravic, Robin E., author
Aspen Publication, 1977
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1987
Buku Teks
Fortenberry, John L., Jr., author
Jones & Bartlett Learning, 2011
Buku Teks
Cleverley, William O., author
Aspen Publication, 1997
Buku Teks