Gewirtz, Herman
Barron`s, 1994
Buku Teks
Rees, W.G.
Cambridge University Press, 1994
Buku Teks
Arons, Arnold B.
John Wiley & Sons, 1990
Buku Teks
Carico, Charles
John Wiley & Sons, 1983
Buku Teks
edited by Thomas L. O'Kuma, David P. Maloney and Curtis J. Hieggelke
Prentice-Hall, 2000
Buku Teks