Levy, Michael, 1950-, author
[Publisher not identified], 2001
Multimedia
Mason, J. Barry, author
Business Publications, 1987
Buku Teks
Bolen, William H.
Prentice Hall International, 1988
Buku Teks
Jones, Peter H.
Butterworth, 1990
Buku Teks
Hasty, Ronald W.
Harper & Row, Publishers, 1983
Buku Teks