Cortesi, David E.
Holt, Rinehart and Winston, 1982
Buku Referensi
Dahmke, Mark, author
Mc Graw-Hill, 1984
Buku Teks
Fernandez, Judi N., 1941-, author
John Wiley & Sons, 1980
Buku Teks
Foxley, Eric, author
Addison-Wesley, 1985
Buku Teks
c. 1987
Buku Referensi