Greene, Judith
Methuen , 1975
Buku Teks SO
Zulauf, Carol Ann
[American Society for Training and Development Press, American Society for Training and Development Press], 2000
eBooks
Bloom, Lois
New York John Wiley & Sons 1978
Buku Teks
Gleason, Jean Berko
Pearson, 2005
Buku Teks SO
Hoff, Erika, 1951-
Wadsworth, 2005
Buku Teks SO