Jobber, David
Prentice-Hall, 2000
Buku Teks SO
Thomas, Wayne M.
Amacom, 2008
Buku Teks SO
Thomas, Wayne M.
Amacom, 2008
eBooks
Miller, William
American Management Association, 2009
eBooks
Lambert, Brian W.
American Society for Training & Development, 2009
eBooks