1. “The Complete Drug Reference”, 33th edition, Pharmaceutical Press, London, pp. 671-674, 2002.
2. In “The Pharmacological Basis of Therapeutics”, (Eds.), 9th edition, McGraw-Hill, New York, pp. 399-430, 1966.
3. European Pharmacopoeia 4th edition, Council of Europe, Strasbourg, p. 954, 2002.
4. British Pharmacopoeia, The Stationery Office Ltd., London, pp. 374-375, 1998.