McDonald, Mlcolm, author
John Wiley & Sons, 2011
Buku Teks
Ng, Stephanie, author
John Wiley & Sons, 2013
Buku Teks
Jackson, Acy L., author
VGM Career Books, 2003
Buku Teks
Eline, Leanne, author
[American Society for Training and Development Press, American Society for Training and Development Press], 1997
eBooks
Newhouse, Bertha S.
McGraw-Hill, 1983
Buku Teks