Albrecht, Gary L.
Connecticut JAI Press, 1994
Buku Teks
Downie, R.S
Oxford University Press, 1994
Buku Teks
Tan, Joseph, author
Jossey-Bass, 2005
Buku Teks
Ruchlin, Hirsch S
Charles C Thomas , 1973
Buku Teks
Feldstein, Paul J., author
John Wiley & Sons, 1988
Buku Teks