Berger, P.
Buchdruckerei Gasser and Cie, 1977
Buku Teks
Gasche, Rodolphe
Harvard University Press, 1994
Buku Teks
Needham, Rodney, author
Tavistock Publications, 1974
Buku Teks
Keeley, Joseph C., author
McGraw-Hill Book Company, Inc. , 1950
Buku Teks
editor, Theodore Baumeister, Eugene A. Avallone
McGraw-Hill, 1978
Buku Referensi