Delson, Donn, author
Bradson Press, 1983
Buku Referensi
Goode, Walter, author
Cambridge University Press, 2007
Buku Referensi
Cuddon, J.A., author
Penguin Books, 1979
Buku Referensi
Greenstein, Carol Horn, author
Van Nostrand Reinhold, 1978
Buku Referensi
Henderson, I. F., author
Harlow, England Longman Scientific and Technical
Buku Referensi