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WikiPedia: Vitamin_A http://www.emedicine.com/emerg/topic638.htm http://www.emedicine.com/med/topic2382.htm http://www.nutritiondata.com/facts/pork-products/2... http://www.nutritiondata.com/facts/vegetables-and-... http://www.nutritiondata.com/facts/vegetables-and-... http://www.nutritionj.com/content/7/1/7 http://www.mrw.interscience.wiley.com/emrw/9780470... http://www.iom.edu/Object.File/Master/7/296/webtab... http://lpi.oregonstate.edu/infocenter/vitamins/vit... http://www.dietary-supplements.info.nih.gov/factsh...