APA (7th ed.) Citation

Callen, P. W., Norton, M. E., & Scoutt, L. M. (2017). Callen's ultrasonography in obstetrics and gynecology (Sixth edition.). Elsevier.

Chicago Style (17th ed.) Citation

Callen, Peter W., Mary E. Norton, and Leslie M. Scoutt. Callen's Ultrasonography in Obstetrics and Gynecology. Sixth edition. Philadelphia, PA: Elsevier, 2017.

MLA (9th ed.) Citation

Callen, Peter W., et al. Callen's Ultrasonography in Obstetrics and Gynecology. Sixth edition. Elsevier, 2017.