Cordiner, Ralph J.
McGraw-Hill Book Company, Inc., 1956
Buku Teks
Lendrum, Tony, author
McGraw-Hill, 1995
Buku Referensi
Greenwood, Ronald G., author
Lexinton Books, 1974
Buku Teks
Ali Masykur Musa, author
Lembaga Pangkajian MPR RI, 2017
Artikel Jurnal
Raymond, Thomas Cicchino, author
McGraw-Hill, 1964
Buku Teks