@inbook{1193311645, author={Glenn D. Posner}, editor={Posner, Glenn D. and Black, Amanda Y. and Jones, Griffith and El-Chaâr, Darine}, title={Engagement, Synclitism, Asynclitism}, booktitle={Oxorn-Foote Human Labor & Birth, 7e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2022}, url={obgyn.mhmedical.com/content.aspx?aid=1193311645} }