@inbook{1189289227, author={Patricia M. Schoon and Carolyn M. Porta and Marjorie A. Schaffer}, title={Omaha System}, booktitle={Population-Based Public Health Clinical Manual: The Henry Street Model for Nurses, 3e}, publisher={Sigma Theta Tau International}, address={New York, NY}, year={2019}, url={apn.mhmedical.com/content.aspx?aid=1189289227} }