Rickertsen, Rick, author
American Management Association, 2006
eBooks
Monger, Rod F., author
The Free Press, 1988
Buku Teks
Zweifel, Thomas D., author
Selectbooks, 2009
Buku Teks
Brecher, Bob
New York Routledge , 1998
Buku Teks
Kotler, Philip, author
John Wiley & Sons, 2005
Buku Teks