1. U.S. Department of Agriculture, Food and Nutrition Service. Supplemental Nutrition Assistance Program. 2013. Available at: http://www.fns.usda.gov/snap/facts-about-snap. Accessed November 14, 2013.
2. Humphrey DB. The economics of electronic benefit transfer payments. Econ Q. 1996;82(2):77–94. Available at: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2125911. Accessed December 2, 2012.
3. U.S. Department of Agriculture, Agricultural Marketing Services. USDA farmers’ markets database. 2014. Available at: http://search.ams.usda.gov/farmersmarkets/. Accessed August 12, 2014.
4. National Conference for State Legislatures. 2014. Increasing Access to Farmers' Markets. Available at: http://www.ncsl.org/research/agriculture-and-rural-development/farmers-market.aspx. Accessed September 2, 2014.