Não informado. (1924). Crops and markets. U.S. Department of Agriculture, Agricultural Marketing Service.
Chicago-viite (17. p.)Não informado. Crops and Markets. Washington: U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
MLA-viite (8. p.)Não informado. Crops and Markets. U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.