1. W. O. Foye,Principles of Medicinal Chemistry, Lea & Febiger, Philadelphia, 1976, pp. 288, 688.
2. The Merck Index, An Encyclopedia of Chemicals, Drugs and Biologicals, 10th Ed., 1983, p. 7176.
3. British Pharmacopoeia, The Pharmaceutical Press, London, 1968, p. 1156.
4. British Pharmacopoeia, HM Stationary Office, London, 1988.
5. The United States Pharmacopeia XXII, National Formulary XVII, US Pharmacopeial Convention, Rockville, MD, 1990.