1. Devlin RM (1975) Plant physiology, 3rd. ed. New York: Van Nostrand.
2. Craft NE, Wise SA (1993) Individual carotenoid content of SRM 1548 total diet and influence of storage carotenoids. J Agric Food Chem 41: 208?213.
3. Butrum RR, Clifford CK, Lanza E (1988) NCI dietary guidelines: Rational. Am J Clin Nutr 48: 888?895.
4. Adams CF (1975) Nutritive value of American foods: In common units. Agriculture Handbook No. 456. Washington, DC: US Dept. of Agriculture.
5. Goodwin TW, Goad LJ (1970) Carotenoids and triterpenoids. In AC Hulme (ed), The biochemistry of fruits and their products, Vol 1, pp 305?368. New York: Academic Press.