@inbook{57793186,
author={Robert F. Reardon and Jamie Hess-Keenan and Chad E. Roline and Liberty V. Caroon and Scott A. Joing},
editor={Ma, O. John and Mateer, James R. and Reardon, Robert F. and Joing, Scott A.},
title={Chapter 14. First Trimester Pregnancy},
booktitle={Ma and Mateer's Emergency Ultrasound, 3e},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2014},
url={accessemergencymedicine.mhmedical.com/content.aspx?aid=57793186}
}