Steinberg, Laurence, author
Wadsworth and Cengage Learning, 2011
Buku Teks
Cowan, Stella Louise, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks
Wardiman Djojonegoro, author
Ministry of Education and Culture , 1994
Buku Teks
Jean-Claude Bolay, Megali Schmid, Gabriela Tejada, Eileen Hazboun, editors
[Springer, ], 2012
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Panennungi, Maddaremmeng A., author
De La Salle University Publishing House, 2014
Artikel Jurnal