@inbook{8136027, author={Daniel N. Hooker and William E. Prentice}, editor={Prentice, William E. and Quillen, William S. and Underwood, Frank}, title={Chapter 5. Basic Principles of Electricity and Electrical Stimulating Currents}, booktitle={Therapeutic Modalities in Rehabilitation, 4e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2011}, url={accessphysiotherapy.mhmedical.com/content.aspx?aid=8136027} }