Não informado. (1957). Foreign agriculture circular. U.S. Department of Agriculture, Foreign Agricultural Service.
Čikaški stil citiranja (17. izdanje)Não informado. Foreign Agriculture Circular. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1957.
MLA način citiranja (8. izdanje)Não informado. Foreign Agriculture Circular. U.S. Department of Agriculture, Foreign Agricultural Service, 1957.
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