Não informado. (2004). Ers. U.S. Department of Agriculture, Economic Research Service.
Style de citation Chicago (17e éd.)Não informado. Ers. Washington: U.S. Department of Agriculture, Economic Research Service, 2004.
Style de citation MLA (8e éd.)Não informado. Ers. U.S. Department of Agriculture, Economic Research Service, 2004.
Attention : ces citations peuvent ne pas être correctes à 100%.