Não informado. (1963). World agricultural production and trade. U.S. Department of Agriculture, Foreign Agricultural Service.
Citação do estilo Chicago (17ª ed.)Não informado. World Agricultural Production and Trade. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1963.
Citação MLA (8ª ed.)Não informado. World Agricultural Production and Trade. U.S. Department of Agriculture, Foreign Agricultural Service, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.