1. The Merck Index, An Encyclopedia of Chemicals, Drugs and Biologicals;O’Neil,2001
2. American Hospital Formulary Service®;McEvoy,2001
3. Martindale the Complete Drug Reference;Sweetman,2005
4. United States Pharmacopeia 28-NF 23. United States Pharmacopeial Convention, INC., Rockville, MD, 2005, p. 260.