@inbook{1156989488, author={Peggy A. Houglum and Dolores B. Bertoti}, title={Muscle Activity and Strength}, booktitle={Brunnstrom's Clinical Kinesiology, 6e}, publisher={F. A. Davis Company}, address={New York, NY}, year={2012}, url={fadavispt.mhmedical.com/content.aspx?aid=1156989488} }