Shoemaker, Donald J., author
Oxford Univesity Press, 2000
Buku Teks
Cambridge University Press, 1996
Buku Teks
McGuire, Joseph W., author
Prentice-Hall, 1964
Buku Teks
Britt, Steuart Henderson, author
John Wiley & Sons, 1968
Buku Teks
Hagan, Frank E., author
Nelson-Hall, 1989
Buku Teks