Akay, A. ., and E. Yanikkerem. “Prenatal, Obstetric, Neonatal Outcomes and Contraceptive Behaviors in Women With Four or More Pregnancies”. International Journal of Child Health and Nutrition, vol. 6, no. 1, Mar. 2017, pp. 43-53, doi:10.6000/1929-4247.2017.06.01.4.