Briggs, Mark, author
Sage, 2012
Buku Teks
Waagen, Alice K., author
American Society for Training & Development Press, 2000
eBooks
Boyer, Kenneth Karel, author
[American Management Association;, ], 2005
eBooks
Weber, Larry, author
John Wiley & Sons Inc., 2009
Buku Teks
Foonberg, Jay G.
The American Bar Association, 1976
Buku Teks