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.

Economic research service, USDA, Paul Gibson, John Wainio, Daniel Whitley, and M. Bohman. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.

Economic research service, et al. Profiles of Tariffs in Global Agricultural Markets: Agricultural Economic Report No 796. 2001.