1. The United States Pharmacopia (USP XIX), “The United States Pharmacopeial Convention Inc.”, Md. (1985), p. 316.
2. The Merck Index,1983
3. Clarke's Isolation and Identification of Drugs in Pharmaceuticals, Body Fluids, and Post-Mortem Material, 2nd Edn.,1986
4. Remington's Pharmaceutical Sciences,1985
5. Product Information: Vasoxyl&rgrave;, Burroughs-Wellcome, 1987.