libr. women's medicine, (ISSN: 1756-2228) DOI 10.3843/GLOWM.10101Austin, C and Short R (1972) Embryonic and fetal development. Cambridge University Press. Pg 78Blackburn, Susan Tucker (2007) Maternal, Fetal and Neonatal Physiology: A Clinical Perspective 3rd Edition. Saunders Elsevier. Pg 104.Colorado State University (2000) Transport Across the Placenta http://arbl.cvmbs.colostate.edu/hbooks/pathphys/reprod/placenta/transport.html [accessed 01/15/2014]Donnelly, Leo and Campling , Gillian (2011) Functions of the placenta, Anesthesia & Intensive Care Medicine, volume 12, issue 3, March 2011, pages 111-115, ISSN 1472-0299, http://dx.doi.org/10.1016/j.mpaic . 2010.11.001.Embryology (nd) The physiology of the placenta: role of the placenta in the processes of feto-maternal exchange. Human embryology. http://www.embryology.ch/anglais/fplacenta/fisio02.html [accessed 01/15/2014]Encyclopaedia Britannica (2007) Blood (biochemistry): Respiration http://www.britannica.com/EBchecked/topic / 69685/blood/35406/Respiration#ref249261 [accessed
tags