Walters, Brenda L., author
Upper Saddle River Prentice Hall , 1996
Buku Teks
Crumlish, Christian, author
McGraw-Hill , 1996
Buku Teks
Anita Bar Yusuf, author
Universitas Indonesia, 2008
UI - Tesis (Open)
Academic Press, 2013
eBooks
Laughlin, Fredric L., author
American Management Association, 2007
eBooks