Campbell, Enid Mona, author
The Law Book, 1967
Buku Teks
Crano, William D., author
Lawrence Erlbaum Assossiate, 2002
Buku Teks
Schwab, Donald P, author
New jersey, 2005
Buku Teks
Wiersma, William, author
Pearson/Allyn and Bacon, 2005
Buku Teks
Cooper, Donald R., author
McGraw-Hill, 2001
Buku Teks