@inbook{1106375731, author={Glenn D. Posner}, editor={Posner, Glenn D. and Dy, Jessica and Black, Amanda and Jones, Griffith D.}, title={Engagement, Synclitism, Asynclitism}, booktitle={Oxorn-Foote Human Labor & Birth, 6e}, publisher={McGraw-Hill Medical}, address={New York, NY}, year={2015}, url={obgyn.mhmedical.com/content.aspx?aid=1106375731} }