(1949). Experience with Human Factors in Agricultural Areas of the World. Extension Service, U.S. Department of Agriculture,.
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Čikaški stil citiranja (17. izdanje)
Experience with Human Factors in Agricultural Areas of the World. Washington, D.C.: Extension Service, U.S. Department of Agriculture,, 1949.
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MLA način citiranja (9. izdanje)
Experience with Human Factors in Agricultural Areas of the World. Extension Service, U.S. Department of Agriculture,, 1949.
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