Economic research service, USDA, Gibson, P., Wainio, J., Whitley, D., & Bohman, M. (2001). Profiles of tariffs in global agricultural markets: Agricultural economic report No 796.
Chicago-referens (17:e uppl.)Economic research service, USDA, Paul Gibson, John Wainio, Daniel Whitley, och M. Bohman. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.
MLA-referens (9:e uppl.)Economic research service, et al. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.
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