Meyer WW, Rumpelt HJ, Yao AC, Lind J. Srpanj 1978. Structure and closure mechanism of the human umbilical artery. Eur. J. Pediatr. 128 (4): 247–59. doi:10.1007/BF00445610. PMID668732CS1 održavanje: više imena: authors list (link)
Meyer WW, Rumpelt HJ, Yao AC, Lind J. Srpanj 1978. Structure and closure mechanism of the human umbilical artery. Eur. J. Pediatr. 128 (4): 247–59. doi:10.1007/BF00445610. PMID668732CS1 održavanje: više imena: authors list (link)
McDonald, SJ; Middleton, P; Dowswell, T; Morris, PS. 11. srpnja 2013. Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes. The Cochrane database of systematic reviews. 7: CD004074. PMID23843134