@inbook{6152458, author={Nancy Hamilton and Wendi Weimar and Kathryn Luttgens}, title={Chapter 21. Locomotion: When Suspended and Free of Support}, booktitle={Kinesiology: Scientific Basis of Human Motion, 11e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2008}, url={accessphysiotherapy.mhmedical.com/content.aspx?aid=6152458} }