Underhill, Brian O., author
Berrett-Koehler Publishers, Inc., 2007
Buku Teks
Haskell Scchell, Erwin
McGraw-Hill Book Company, INC, 1957
Buku Teks
Hague, Hawden, author
Macmillan, 1974
Buku Teks
Haneberg, Lisa, author
American Society for Training & Development, 2007
eBooks
Crittendon, Robert, author
[American Management Association;, ], 2002
eBooks