Ewen, Dale, author
Thomson Brooks/Cole, 2007
Buku Teks
Juszli, Frank L.
Prentice-Hall, 1969
Buku Teks
Devine, Donald F., author
John Wiley and Sons, 1977
Buku Teks
Kramer, Arthur D., author
McGraw-Hill, 1984
Buku Teks
Washington, Allyn J., author
Pearson - Prentice Hall, 2009
Buku Teks
Ewen, Dale, author
Prentice-Hall, 1983
Buku Teks