Kao, John J., author
Prentice-Hall, 1991
Buku Teks
Davenport, Thomas H., author
Publicis, 2006
Buku Teks
Oxford University Press, 2005
Buku Teks
Phillips, Jeffrey, author
McGraw-Hill, 2012
Buku Teks
Vangundy, Arthur B., author
American Management Association, 2007
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