Robbins, Stephen P., author
Prentice-Hall, 1990
Buku Teks
Titcomb, T. J., author
[American Society for Training and Development Press, American Society for Training and Development Press], 1998
eBooks
Peltonen, Tuomo, author
Emerald, 2016
eBooks
Pepall, Lynne, author
Thomson , 2005
Buku Teks
Ross, Murray G., author
Harper & Row, 1955
Buku Teks