Pennington, Randy, author
John Wiley & Sons, 2006
Buku Teks
Duncan, Tom, author
McGraw-Hill, 2002
Buku Teks
Duncan, Tom, author
McGraw-Hill, 2002
Buku Teks
Thiel, Peter A., author
Virgin Books, 2015
Buku Teks
Domenick, Kate, author
American Society for Training & Development, 2007
eBooks