1. Tanner, C.M., and Goldman, S.M., Epidemiology of Parkinson's disease. Neurol. Clin. 14:317–335, 1996.
2. P. C.-M. P. D. Association. (2012, December 10). Parkinson Centre-Malaysian Parkinson Disease Association. Why is a Parkinson Centre needed?. Available: Available online: http://www.mpda.org.my/helpparkinsonclub.php . Accessed 26 Oct 2014
3. De Rijk, M., Launer, L., Berger, K., Breteler, M., Dartigues, J., Baldereschi, M., et al., Prevalence of Parkinson's disease in Europe: A collaborative study of poupulation-based cohorts. Neurol. 54:S21–S23, 2000.
4. Goodman, L.S., Goodman and Gilman's the pharmacological basis of therapeutics vol. 1549. McGraw-Hill, New York, 1996.
5. Lang, A.E., and Lozano, A.M., Parkinson's disease. N. Engl. J. Med. 339:1044–1053, 1998.