Hart, B.H. Liddell
Frederick A. Praeger, 1961-1965
Buku Teks SO
Reich, Robert B.
Boston, 2002
Buku Teks
Meyer, Kathy
[American Society for Training & Development;, ], 1997
eBooks
Meer, Vonne van der
Uitgeverij Contact, 2007
Buku Teks
Goddard, Robert
Corgi Books, 1992
Buku Teks SO