1. U.S. Agricultural Productivity: A Review of USDA Economic Research Service Methods;Shumway;Applied Economic Perspectives and Policy,2016
2. Alston J. “The Benefits from Agricultural Research and Development, Innovation, and Productivity Growth.” Organization for Economic Cooperation and Development (OECD) Food, Agriculture and Fisheries Working Papers, No. 31, Paris: OECD, 2010.
3. Productivity Growth in Global Agriculture Shifting to Developing Countries;Fuglie;Choices,2012