Não informado. (1919). Department circular. U.S. Department of Agriculture.
Citace podle Chicago (17th ed.)Não informado. Department Circular. Washington: U.S. Department of Agriculture, 1919.
Citace podle MLA (8th ed.)Não informado. Department Circular. U.S. Department of Agriculture, 1919.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..