Fitzpatrick, Peter B., author
AMA Membership Publications Division, American Management Association, 1985
Buku Teks
Czinkota, Michael R., author
The Dryden Press, 1996
Buku Teks
Keegan, Warren J., author
Pearson , 2013
Buku Teks
Cundiff, Edward W., author
Prentice-Hall, 1988
Buku Teks
Tomasowa, Judith Marilyn, author
Universitas Indonesia, 2007
UI - Tesis Membership