1. J Agri Food Chemistry 1992; Vol. 40.
2. J Agri Food Chemistry 1992; Vol. 37.
3. Stitt, P. A. Why George Should Eat Broccoli. Dougherty Co., Milwaukee, WI. 1990; 399 pp.
4. USDA Agricultural Handbook No. 8 and sequels; strictly nutritional data.
5. Pedersen, M. Nutritional Herbology. Pederson Publishing, Bountiful, UT 1987; 377 pp.