SONAWANE, P. K. Comparative study between unengaged and engaged fetal head in primigravida at term or in labour. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 7, n. 11, p. 4569–4574, 2018. DOI: 10.18203/2320-1770.ijrcog20184509. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/5503. Acesso em: 14 oct. 2025.