Dillman, Caroline Matheny
Lear Siegler, 1972
Buku Teks
Sharpe, Cat, author
[American Society for Training and Development Press, American Society for Training and Development Press], 2000
eBooks
Cantor, Nathaniel, author
Agathon Press, 1972
Buku Teks
Kim, Tog-yong, 1958-
Inmul kwa Sasangsa, 2007
Buku Teks
Doan, Tran Van
The council for research in values and philosophy , 2000
Buku Teks