References
- United States Pharmecopoeia . 1990 . 209 – 210 . MD : Us. Pharmacopoeia convention Rockville . XX Rev.
- United States Pharmecopoeia . 1980 . 81 Rockville, M. D. : U. S. Pharmacopoeia Convention Inc. . XX Rev.
- British Pharmacopoeia . 1980 . 739 – 740 . London, , UK : The Pharmaceutical Press .
- British Pharmacopoeia . 1980 . 757 London, , UK : The Pharmaceutical Press .
- The Pharmacopoeia of India . 1966 . 58 – 59 . Nasik, , India : Goverment of India Press . Supplement (1975)
- The Pharmacopoeia of India . 1966 . 9 Nasik, , India : Government of India Press . Supplement (1975)