Retrieved 2007-02-19. Cite web URL http://www.,umm.edu/altmed/ConsSupplements/VitaminCAscorbicAcidcs.html Title Vitamin C (Ascorbic Acid) Source date April 2002 Publisher University of Maryland Medical Center URL access date 2007-02-19 ↑ Pauling L (1970). "Evolution and the need for ascorbic acid".