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2. Manual of Antenatal Pathology and Hygiene: The Embryo, Vol;Ballantyne, J.W.,1904
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4. Absent umbilical artery;Bourne, G.L.; Benirschke, K.;Archives of Disease in Childhood,1960
5. Agenesie van een arteria umbilicalis;de Clercq, A.; Vlietinck, R.F.; van Vaerenbergh, P.; Thiery, M.; Derom, R.;Tijdschrift voor Geneeskunde,1970