Artikel Jurnal
Lindsay, James F.
Beavevton Matrix Publishers 1987,
Buku Referensi
Sularso, author
Semarang: Satya Wacana, 1991
Buku Teks
Krishnan, R
Upper Saddle River, N.J Prentice-Hall 2001,
Buku Teks
Velayati Puspa Pertiwi, author
Fakultas Teknik Universitas Indonesia, 2012
UI - Skripsi (Open)