Thomas, Robert M.
Sybex, 1991
Buku Referensi
Handi Chandra, author
Elex Media Komputindo, 2001
Buku Teks
Johnson, Frank J., author
McGraw-Hill, 1991
Buku Teks
Shrock, Cheryl R., author
Industrial Press, 2011
Buku Teks
Kirkpatrick, James M., author
Prentice-Hall, 1998
Buku Teks