1. "Fetal Circulation" fra American Heart Association: https://www.heart.org/en/health-topics/congenital-heart-defects/about-congenital-heart-defects/fetal-circulation
2. "Overgang fra føtal til neonatal cirkulation" af Medscape: https://emedicine.medscape.com/article/182753-overview
3. "Fetal and Neonatal Physiology" af Richard A. Polin og Steven H. Abman
4. "The Physiology of the Fetal and Neonatal Circulation" af John M. Lorenz og Steven M. Donn.