Franklin, Jack L.
John Wiley & Sons, 1976
Buku Teks SO
Epstein, Irwin
Columbia Univ. Press, 1977
Buku Teks
Perrin, Karen M.
Jones & Bartlett Learning, 2016
Buku Teks
Phillips, Patricia Pulliam
[American Society for Training & Development Press;, ], 2003
eBooks
Boruch, Robert F.
Thousand Oaks, 1997
Buku Teks SO