1. U.S. Department of Agriculture. National school lunch program: participation and lunches served. www.fns.usda.gov/pd/slsummar.htm.
2. U.S. Department of Agriculture. Dietary guidelines for Americans, 1995. www.cnpp.usda.gov/DGAs1995Guidelines.htm.
3. Meals offered and served in US public schools: do they meet nutrient standards?;Crepinsek;J Am Diet Assoc,2009
4. Healthy, Hunger-Free Kids Act of 2010. Public Law 111-296, 124 stat., 3183. 2010.
5. Nutrition standards in the national school lunch and school breakfast programs;Federal Register,2012