Zweifel, Thomas D., author
Selectbooks, 2009
Buku Teks
Burley-Allan, Madelyn, author
John Wiley & Sons, 1982
Buku Teks
Harvard Business School Press, 2004
Buku Teks
Battell, Chris, author
American Society for Training & Development, 2006
eBooks
Wiley-Blackwell, 2010
eBooks