editor, M. Goodfellow, A.G. O`Donnel
Academic Press, 1993
Buku Referensi
Radford, Albert E., author
Harper and Row, 1986
Buku Teks
Brachet, Jean
Academic press, 1957
Buku Teks
Kasdon, S. Charles
Boston: Little, Brown & Co., 1962,
Buku Teks
Dnyansagar, V. R.
McGraw-Hill, 1992
Buku Teks