Martin, Shan
Sage Publications, 1983
Buku Teks
Rainey, Hal G., author
John Wiley & Sons, 2003
Buku Teks
Greenberg, Jerald, author
Pearson Education, 2003
Buku Teks
Barron, Robert A., author
Allyn and Bacon, 1990
Buku Teks
Greenberg, Jerald, author
Prentice-Hall, 2003
Buku Teks