Gewirtz, Herman, author
Barron`s, 1994
Buku Teks
Arons, Arnold B., author
John Wiley & Sons, 1990
Buku Teks
Rees, W.G., author
Cambridge University Press, 1994
Buku Teks
Christian, Wolfgang
Pearson Education, 2004
Multimedia
Wells, Dare A., author
McGraw-Hill, 1983
Buku Teks