Ehrlich, J. W., author
Oceana Publications, 1962
Buku Teks
Stevenson, Burton, author
New York, Harper & Brothers
Buku Referensi
Andreas, author
Fakultas Teknik Universitas Indonesia, 2004
UI - Skripsi (Membership)
Artikel Jurnal
Davis, Kenneth C., author
Perennial, 2004
Buku Teks