Kay, Judy, author
Addison-Wesley, 1989
Buku Teks
Valley, John J., author
Sams, 1992
Buku Referensi
Frakes, William B. (William Bruce), 1852-, author
Prentice-Hall, 1991
Buku Teks
Kelley, Al., author
The Benjamin Cumming Pub., 1984
Buku Teks
Plum, Thomas, author
Prentice-Hall, 1984
Buku Referensi