1. Hens, J. (1975)Structural effects on equilibria in organic chemistry, Wiley, New York.
2. Loudon, G. Mark. (2002)Organic chemistry, 4th edn, p. 317. Oxford University Press, New York.
3. Rao, G. N. (1989) Complex equilibria of some biologically important metal ions in aquo-organic media. PhD thesis, Andhra University, Visakhapatnam, India.
4. Rao, R. S. and Rao, G. N. (2005)Computer applications in chemistry, Himalaya Publishing House, Mumbai, pp. 302.
5. Taft, R. W. (1983)Progress in physical organic chemistry,Vol. 14, pp. 247–350. John Wiley & Sons, New York.