1. Sparks, R. E. 1981.Encyclopedia of Chemical Technology,, 3rd ed., Edited by: Grayson, M. Vol. 15, 470–493. New York: Wiley Interscience.
2. Thies, C. 1995.Encyl. Chem. Technol, Kirk-Othmar,, 4th ed., Vol. 16, 627–651. New York: John Wiley & Sons.
3. Hill, I. R. and Wright, S. J. L. 1978.Pesticides Microbiology, 112–120. London: Academic Press.