Miller, Mark A.
M&T Books, 1991
Buku Referensi
Hein, Mathias
International Thomson Computer Press, 1997
Buku Teks SO
Choi, Won-Oh
Global Oriental, 2008
Buku Teks
Farrell, Jane
J.B. Lippincott, 1986
Buku Teks SO
Charle, Suzanne
Collins, 1990
Buku Referensi