Harvard Business School Press, 2001
Buku Teks
Behn, Robert D., author
Basic Books, 1982
Buku Teks
Hogart, Robin M
John Wiley, 1994
Buku Teks
White, D. J.
North-Holland Publishing Company, 1976
Buku Teks
Taylor, George A., author
D. Van Nostrand, 1964
Buku Teks