Couger, J. Daniel
John Wiley & Sons, 1975
Buku Teks
Mockler, Roberty
Prentice Hall Internasional, 1989
Buku Teks
Arrillaga, J.
John Wiley & Sons, 1983
Buku Teks
Lauby, Sharlyn J.
[American Society for Training and Development Press;, ], 2005
eBooks
Benzhaf, Walter
Prentice-Hall, 1989
Buku Teks