Hemisphere , 1991
Buku Teks
Ramsay, Michael C.
John Wiley & Sons, 2002
Buku Teks
edited by Ronald J. Prinz
Jessica Kingsley, 1991
Buku Teks
Mitchell, Jennifer K.
American Society for Training & Development, 2006
eBooks
Robinson, Dana Gaines
[American Society for Training & Development Press, American Society for Training & Development Press], 2000
eBooks