Chandler, John, author
McGraw-Hill, 1982
Buku Teks
Willmore, Joe, author
[American Society for Training and Development Press;American Society for Training and Development Press, American Society for Training and Development Press], 1998
eBooks
Said Muhammad Zulfitri, author
Faculty of Administrative Science Universitas Brawijaya, 2014
Artikel Jurnal
Kahane, Adam, author
Berrett-Koehler Publishers, 2012
Buku Teks
Bartholomew, David J., author
John Wiley & Sons, 1979
Buku Teks