1. Williams Obstetrics. Implantation, Embryogenesis, and Placental Development: Introduction. 24th ed. pp. 116-125
2. DC Dutta’s Textbook of Obstetrics. The Placenta and Fetal Membranes. 7th ed. pp. 28-37
3. Arulkumaran S, Sivanesaratnam V, Chatterjee A, Kumar P. Essentials of Obstetrics. 3rd ed. Jaypee Brothers Medical Publishers (P) Ltd. pp. 82-85
4. Liu CC, Pretorius DH, Scioscia AL, Hull AD. Sonographic prenatal diagnosis of marginal placental cord insertion: Clinical importance. Journal of Ultrasound in Medicine. 2002;21:627-632
5. Rhone SA, Magee F, Remple V. The association of placental abnormalities with maternal and neonatal clinical findings: A retrospective cohort study. Journal of Obstetrics and Gynaecology Canada. 2003;25(2):123-128