Bocchetta, Vittore E., author
Follett Publishing Company, 1987
Buku Referensi
James, James, author
Van Nostrand Reinhold, 1976
Buku Referensi
Holder, R.W.
New York : Oxford University Press, 1995,
Buku Referensi
Rees, Nigel, author
Cassell Publishers, 1995
Buku Referensi
Read, P.G.
Butterworth Scientific, 1988
Buku Referensi