@inbook{1138249755,
author={Leslie G. Portney and Mary P. Watkins},
title={Power and Sample Size},
booktitle={Foundations of Clinical Research: Applications to Practice, 3e},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2017},
url={fadavispt.mhmedical.com/content.aspx?aid=1138249755}
}