Murphy, Henry C., author
McGraw-Hill, 1950
Buku Teks
Martin Hidayat, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2010
UI - Skripsi (Open)
Artikel Jurnal
Pike, Douglas, 1908-1974, author
MIT Press, 1968
Buku Teks
Nguyen-Truong
Regional Institute of Higher Education and Development , 1974
Buku Teks