1. USP 29 NF 24, United States Pharmacopoeia (2005) United States Pharmacopeial Convention, Inc., Rockville
2. James Reynolds EF, Part I, Martindale, The Extra Pharmacopoeia (1996) 31st edn. Royal Pharmaceutical Society of Great Britain, London
3. BP’ 2005, British Pharmacopoeia (2005) The Stationary Office on behalf of the Medicines and Healthcare products Regulatory Agency (MHRA), vol I–II
4. Arayne MS, Sultana N, Zuberi MH (2006) Pak J Pharm Sci 19:231–235
5. Madhira BS, Vaibhav DM, Dimal AS, Kashyap KB, Rajendra SM, Madhira G, Binita JP (2005) J AOAC Int 88:1167–1172