Geary, David M.
Sun Microsystems, 1997
Multimedia
arranged and edited by Wolfgang Hageney
Belvedere, 1989
Buku Teks SO
Liestya
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1994
UI - Skripsi Membership
Bruce, Betsy
SAMS Publishing, 2003
Buku Teks
Callahan, Mike
McGraw-Hill, 1990
Buku Teks SO