Não informado. (1941). Crop Production. Department of Agriculture, Statistical Reporting Service.
Citação do estilo Chicago (17ª ed.)Não informado. Crop Production. Washington: Department of Agriculture, Statistical Reporting Service, 1941.
Citação MLA (8ª ed.)Não informado. Crop Production. Department of Agriculture, Statistical Reporting Service, 1941.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.