Oxborrow, Mike
McGraw-Hill, 1993
Buku Referensi
Martin, James, author
Prentice-Hall, 1987
Buku Teks SO
Meijer, Anton, author
John Wiley & Sons, 1988
Buku Teks
Artikel Jurnal
Saragih, Maruli Tua Edison, author
Fakultas Teknik Universitas Indonesia, 1992
UI - Skripsi Membership