Ewen, Dale
Thomson Brooks/Cole, 2007
Buku Teks
Juszli, Frank L.
Prentice-Hall, 1969
Buku Teks
Devine, Donald F.
John Wiley & Sons, 1977
Buku Teks
Kramer, Arthur D.
McGraw-Hill, 1984
Buku Teks
Washington, Allyn J.
Pearson - Prentice Hall, 2009
Buku Teks