National food review Economics, Statistics, and Cooperatives Service, U.S. Department of Agriculture. [electronic resource].
芝加哥风格引文National Food Review Economics, Statistics, and Cooperatives Service, U.S. Department of Agriculture. [electronic Resource].
MLA引文National Food Review Economics, Statistics, and Cooperatives Service, U.S. Department of Agriculture. [electronic Resource].
警告：这些引文格式不一定是100％准确.