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MLA

United States. Department of Agriculture. Human Nutrition Information Service. USDA's food guide pyramid. U.S. Dept. of Agriculture, 1992.

APA

United States. Department of Agriculture. Human Nutrition Information Service. (1992). USDA's food guide pyramid. U.S. Dept. of Agriculture.

Chicago

United States. Department of Agriculture. Human Nutrition Information Service USDA's food guide pyramid. U.S. Dept. of Agriculture, 1992.