Hammond, John S., 1937-, author
Harvard Business School, 1999
Buku Teks
Cooke, Steve
Prentice-Hall, 1991
Buku Teks
Taylor, George A., author
D. Van Nostrand, 1964
Buku Teks
Sudarwan Danim, author
Bumi Aksara, 2005
Buku Teks
Moody, Paul E.
McGraw-Hill, 1983
Buku Teks