Ryan, Thomas P.
John Wiley & Sons, 2011
Buku Teks
Ryan, Thomas P.
Wiley, 1989
Buku Teks
Wadsworth, Harrison M.
John Wiley & Sons, 2001
Buku Teks
Fryman, Mark a.
Delmar/Thomson Learning, 2002
Buku Teks
Chang, Richard Y.
American Society for Training & Development Press, 2000
eBooks