1. US Department of Health and Human Services and US Department of Agriculture. Nutrition and Your Health: Dietary Guidelines for Americans. 1st ed. http://health.gov/dietaryguidelines/1980thin.pdf. Published 1980. Accessed May 11, 2017.
2. US Department of Health and Human Services and US Department of Agriculture. Nutrititon and Your Health: Dietary Guidelines for Americans. 2nd ed. http://health.gov/dietaryguidelines/1985thin.pdf. Published 1985. Accessed May 11, 2017.
3. US Department of Health and Human Services and US Department of Agriculture. Nutrition and Your Health: Dietary Guidelines for Americans. 3rd ed. http://health.gov/dietaryguidelines/1990thin.pdf. Published 1990. Accessed May 11, 2017.
4. US Department of Health and Human Services and US Department of Agriculture. Nutrition and Your health: Dietary Guidelines for Americans. 4th ed. http://health.gov/dietaryguidelines/dga95/. Published 1995. Accessed May 11, 2017.
5. US Department of Health and Human Services and US Department of Agriculture. Nutrition and Your health: Dietary Guidelines for Americans. 5th ed. http://health.gov/dietaryguidelines/dga2000/document/frontcover.htm. Published 2000. Accessed May 11, 2017.