Altman, Edward I.
John Wiley & Sons, 1983
Buku Teks
Westman, Stephen R., author
[American Library association, American Library association], 2006
eBooks
Block, Zenas, author
Harvard Business School Press, 1993
Buku Teks
Kristof, Ray, author
Adobe Press, 1995
Buku Teks
Jones, Graham, author
McGraw-Hill, 1988
Buku Teks