APA (7th ed.) Citation

Maroni, E., De Musso, F., Nanni, M., Giorgetta, F., Youssef, A., Bellussi, F., . . . Ghi, T. (2012). OP18.04: 3D ultrasound evaluation of progression angle, progression distance and midline angle changes in nulliparous women according to second stage length. Ultrasound in Obstetrics & Gynecology, 40, 109. https://doi.org/10.1002/uog.11561

Chicago Style (17th ed.) Citation

Maroni, E., et al. "OP18.04: 3D Ultrasound Evaluation of Progression Angle, Progression Distance and Midline Angle Changes in Nulliparous Women According to Second Stage Length." Ultrasound in Obstetrics & Gynecology 40 (2012): 109. https://doi.org/10.1002/uog.11561.

MLA (9th ed.) Citation

Maroni, E., et al. "OP18.04: 3D Ultrasound Evaluation of Progression Angle, Progression Distance and Midline Angle Changes in Nulliparous Women According to Second Stage Length." Ultrasound in Obstetrics & Gynecology, vol. 40, 2012, p. 109, https://doi.org/10.1002/uog.11561.