@inbook{55793554, author={Jayne R. Wilkinson and Daniel Weintraub and Matthew B. Stern}, editor={Watts, Ray L. and Standaert, David G. and Obeso, Jose A.}, title={Chapter 13. Clinical Manifestations of Parkinson's Disease}, booktitle={Movement Disorders, 3e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2012}, url={accessphysiotherapy.mhmedical.com/content.aspx?aid=55793554} }