United States. Department of Agriculture, United States. Foreign Agricultural Service, & Economic Research Service. The World agricultural situation. [s.n.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. Department of Agriculture, United States. Foreign Agricultural Service, και Economic Research Service. The World Agricultural Situation. Washington: [s.n.
Παραπομπή σε μορφή MLA (9th εκδ.)United States. Department of Agriculture, et al. The World Agricultural Situation. [s.n.
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