References
Babic M. S. & Sapunar D., 1994. Atlas of Human Embryology. [online] Available at: http://www.embryo.chronolab.com/cardiovascular.htm> [Accessed 03/04/2011].
O'Loughlin V. D., 2001. Human Ebryology Animations. [online] (updated 23 March 2006) Available at: http://www.indiana.edu/~anat550/embryo_main/> [Accessed 07 April 2011].
Sadler T.W., 2010. Langman's Medical Embryology. Cardiovascular System. Philadelphia: Lippincott Williams & Wilkins.
Babic M. S. & Sapunar D., 1994. Atlas of Human Embryology. [online] Available at: http://www.embryo.chronolab.com/cardiovascular.htm> [Accessed 03/04/2011].
O'Loughlin V. D., 2001. Human Ebryology Animations. [online] (updated 23 March 2006) Available at: http://www.indiana.edu/~anat550/embryo_main/> [Accessed 07 April 2011].
Sadler T.W., 2010. Langman's Medical Embryology. Cardiovascular System. Philadelphia: Lippincott Williams & Wilkins.