@inbook{1138624617,
author={Robyn Horsager, MD and Scott W. Roberts, MD and Vanessa L. Rogers, MD and Patricia C. Santiago-Muñoz, MD and Kevin C. Worley, MD and Barbara L. Hoffman, MD},
title={Placental Abnormalities},
booktitle={Williams Obstetrics Study Guide, 24e},
publisher={McGraw-Hill Education|Medical},
address={New York, NY},
year={2014},
url={obgyn.mhmedical.com/content.aspx?aid=1138624617}
}