Não informado. (1931). Cotton situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.
Citação do estilo Chicago (17ª ed.)Não informado. Cotton Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1931.
Citação MLA (8ª ed.)Não informado. Cotton Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1931.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.