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Lua i Stíl Chicago (17ú heag.)Economic research service, USDA, Paul Gibson, John Wainio, Daniel Whitley, agus M. Bohman. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.
Lua MLA (9ú heag.)Economic research service, et al. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.
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