Kogan Page, 1993
Buku Teks
Payne, Vivette, author
[American Management Association;, ], 2005
eBooks
edited by Warren G. Bennis
Holt, Rinehart and winston, 1976
Buku Teks
Kissler, Gary D., author
Addison-Wesley, 1991
Buku Referensi
Page, Stephen J.
Elsevier , 2009
Buku Teks