Witting, Amy, 1918
Penguins Books, 1994
Buku Teks
Murphy, Margaret, author
American Society for Training & Development, 2008
eBooks
Charney, Cy., author
[American Management Association, ], 2005
eBooks
3B Scientific, 2002
Multimedia
Mitchell, Jennifer K., author
American Society for Training & Development, 2006
eBooks