Snyder, James, author
John Wiley & Sons, 1998
Buku Teks
McFarlane, Robert, author
Edward Arnold, 1995
Buku Teks
Smith, Bud, author
IDG Books, 1995
Buku Teks
Lewis, Jack R., author
Prentice-Hall, 1982
Buku Referensi
Thomas, Marvin L.
New York: McGraw-Hill, 1978
Buku Teks