Remington: The Science and Practice of Pharmacy 2005 Gennaro, A.R. 21st ed., Mac Publishing Company, USA.
Validation Instruments for Community Pharmacy: Pharmaceutical Care for the Third Millenium 2000 Azzopardi, L.M. New York: Pharmaceutical Products Press.
Pharmaceutical Practice1990 Aulton, M.E., and Collet, D.M. Churchill Livingstone, Longman Group, UK Ltd.