Sheik, Saniya, and Anjana B. “A Study to Assess Predictive Value of Yolk Sac Diameter by Transvaginal Sonography With the Pregnancy Outcome”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 9, no. 3 (February 27, 2020): 997–1002. Accessed December 4, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/7913.