Não informado. (1987). The Journal of Agricultural Economics Research. U.S. Department of Agriculture.
Citace podle Chicago (17th ed.)Não informado. The Journal of Agricultural Economics Research. Washington: U.S. Department of Agriculture, 1987.
Citace podle MLA (8th ed.)Não informado. The Journal of Agricultural Economics Research. U.S. Department of Agriculture, 1987.
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