Greenburg, Steve
Alpha, 2002
Buku Referensi
Bob Gordon, consultant editor; Maggie Gordon, consultant editor
Watson-Guptill Publications, 2002
Buku Teks SO
Aries Kurniawan
Fakultas Teknik Universitas Indonesia, 2010
UI - Skripsi Open
Stover, Allan C.
McGraw-Hill, 1984
Buku Teks
Money, Steve
PC Publishing, 1990
Buku Referensi