Não informado. (1979). Foreign agriculture circular. U.S. Department of Agriculture, Foreign Agricultural Service.
Chicago (17e ed.) BronvermeldingNão informado. Foreign Agriculture Circular. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1979.
MLA (8e ed.) BronvermeldingNão informado. Foreign Agriculture Circular. U.S. Department of Agriculture, Foreign Agricultural Service, 1979.
Let op: Deze citaties zijn niet altijd 100% accuraat.