1. Vincent GK, Velkoff VA. The Older Population in the United States: 2010 to 2050 [Internet]. Current population reports. 2010. [cited 2015 Jan 1]. Available from: http://www.census.gov/prod/2010pubs/p25-1138.pdf .
2. United States Census Bureau. Profile America facts for features [Internet] 2012. [cited 2015 Jan 1. Available from: https://www.census.gov/newsroom/releases/archives/facts_for_features_special_editions/cb12-ff07.html .
3. Jackson J. Race, national origin, ethnicity, and aging. In: Binstock R, Shanas E, editors. Handbook of aging and social sciences. New York: Van Nostrand Rheinhold; 1985. p. 264–8.
4. Office of Management and Budget. Revisions to the standards for classification of Federal data on race and ethnicity. Fed Regist. 1997;62:58781–91.
5. Haynes M, Smedley B, editors. The unequal burden of cancer: an assessment of NIH research and programs for ethnic minorities and the medically underserved. Washington, DC: National Academy Press; 1999.