1. Sixth annual survey of health food stores in America;Health Food Business,1981
2. Development News;Food Product Development,1979
3. Dairy Council Digest;Food faddism Nutrition Review Supplement,1974
4. Where should you be shopping for your family?;Deutch;Nutrition Review Supplement,1974
5. U.S. Bureau of the Census, Statistical Abstract of the United States: 1982–1983 103d ed., Washington, DC, 1982, p. 430.