Marquardt, Michael J., author
American Society for Training and Development Press, 1999
eBooks
Harvard Business School Publishing Corporation, 2001
Buku Teks
Information Resources Management Association, editor.
IGI Global, 2012
Buku Referensi
editors, Marshall Goldsmith, Howard Morgan, Alexander J. Ogg
John Wiley & Sons, 2004
Buku Teks
McElroy, Mark W., author
Butterworth-Heinemann, 2003
Buku Teks