^Ganong, William F.; McPhee, Stephen J.; Lingappa, Vishwanath R. (2005). Pathophysiology of Disease: An Introduction to Clinical Medicine (Lange). McGraw-Hill Medical. p. 107.
ISBN0-07-144159-X.
^Rudolph, Colin David (2003). Rudolph's pediatrics. New York: McGraw-Hill, Medical Pub. Division. p. 1563.
ISBN0-8385-8285-0.