editor Ronald J. Prinz
Jessica Kingsley Publishers, 1991
Buku Referensi
Ramsay, Michael C.
John Wiley & Sons, 2002
Buku Teks
Simeonsson, Rune J.
Allyn and Bacon, 1986
Buku Teks
Robinson, Dana Gaines
American Society for Training & Development Press, 2000
eBooks
Lidz, Carol Schneider
John Wiley & Sons, 2003
Buku Teks