Brown, Martin C., author
Osborne/McGraw-Hill, 1999
Buku Referensi
Stevens, Roger T.
M & T Books, 1989
Buku Teks
Brown, Micah, author
Prentice-Hall, 1999
Buku Referensi
Kelley, Al., author
The Benjamin Cumming Pub., 1984
Buku Teks
Plum, Thomas, author
Prentice-Hall, 1984
Buku Referensi