by Cal M. Lague [and others]
Allyn and Bacon, 1982
Buku Teks
Bruce, Anne
American Society for Training & Development, 2008
eBooks
Gronbeck, Bruce E.
Scott, Foresman, 1979
Buku Teks
Anderson, Chris
Headline Publishing Group, 2016
Buku Teks
Dunckel, Jacqueline
Self-Counsel, 1984
Koleksi Publik