Hanan, Mack, author
[American Management Association, ], 2004
eBooks
Jobber, David, author
Prentice-Hall, 2000
Buku Teks
Eades, Keith M., author
Andi, 2005
Buku Teks
Thomas, Wayne M., author
Amacom, 2008
Buku Teks
Haas, Kenneth B., author
Collier/Macmillan, 1974
Buku Teks