@inbook{1138252815, author={Leslie G. Portney and Mary P. Watkins}, title={Measures of Association for Categorical Variables: Chi-Square}, 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=1138252815} }