Aristyowati
Fakultas Teknik Universitas Indonesia, 2004
UI - Skripsi Membership
Dishongh, Burl E.
Erlangga, 2003
Buku Teks
Siegel, Curt
Universitas Parahyangan, [date of publication not identified]
Buku Teks SO
Wilson, Forrest, 1918-
[publisher not identified], [date of publication not identified]
Buku Teks
Artikel Jurnal