Zenger, John H., author
McGraw-Hill, 2003
Buku Teks
Hart, Lois B., author
[American Management Association;, ], 2005
eBooks
Woolfe, Lorin, author
[American Management Association;, ], 2002
eBooks
Cohen, William A.
Prentice-Hall, 1990
Buku Teks
Harvard Bussiness School Press, 1990
Buku Teks