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Harrison, Margo S., Ana Pilar Betrán, Joshua P. Vogel, Robert L. Goldenberg, et A. Metin Gülmezoglu. "Mode of Delivery Among Nulliparous Women With Single, Cephalic, Term Pregnancies: The WHO Global Survey On Maternal and Perinatal Health, 2004–2008." Int J Gynaecol Obstet 2019.

Harrison, Margo S., et al. "Mode of Delivery Among Nulliparous Women With Single, Cephalic, Term Pregnancies: The WHO Global Survey On Maternal and Perinatal Health, 2004–2008." Int J Gynaecol Obstet 2019.