APA (7th ed.) Citation

RS, K., & S, W. (1996). Ultrasound of the placenta. Clinical obstetrics and gynecology, 39(3), 519. https://doi.org/10.1097/00003081-199609000-00004

Chicago Style (17th ed.) Citation

RS, Kuhlmann, and Warsof S. "Ultrasound of the Placenta." Clinical Obstetrics and Gynecology 39, no. 3 (1996): 519. https://doi.org/10.1097/00003081-199609000-00004.

MLA (9th ed.) Citation

RS, Kuhlmann, and Warsof S. "Ultrasound of the Placenta." Clinical Obstetrics and Gynecology, vol. 39, no. 3, 1996, p. 519, https://doi.org/10.1097/00003081-199609000-00004.