Não informado. (1919). Foreign crops and markets. U.S. Department of Agriculture, Foreign Agricultural Service.
Chicago (17e ed.) BronvermeldingNão informado. Foreign Crops and Markets. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
MLA (8e ed.) BronvermeldingNão informado. Foreign Crops and Markets. U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
Let op: Deze citaties zijn niet altijd 100% accuraat.