Suzanne, Jamie, author
Bantam Books, 1995
Buku Teks
Horton, William, author
ASTD Press, 2001
Buku Teks
edited by Fred Kiesner
World Scientific, 2010
Buku Teks
Odiorne, George S., author
WED International, [Date of publication not identified]
Buku Teks
edited by J. Timothy Harrington and Eric D. Newman
Springer, 2012
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