@inbook{1140330625, author={Heather A. Heaton}, editor={Tintinalli, Judith E. and Stapczynski, J. Stephan and Ma, O. John and Yealy, Donald M. and Meckler, Garth D. and Cline, David M.}, title={Ectopic Pregnancy and Emergencies in the First 20 Weeks of Pregnancy}, booktitle={Tintinalli’s Emergency Medicine: A Comprehensive Study Guide, 8e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2016}, url={accessmedicine.mhmedical.com/content.aspx?aid=1140330625} }