Não informado. (1919). Foreign crops and markets. U.S. Department of Agriculture, Foreign Agricultural Service.
Citação do estilo Chicago (17ª ed.)Não informado. Foreign Crops and Markets. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
Citação MLA (8ª ed.)Não informado. Foreign Crops and Markets. U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.