1. Centers for Disease Control (2009). Health characteristics of adults aged 55 years and over: United States, 2004–2007. Available via Centers for Disease Control. http://www.cdc.gov/nchs / data/nhsr/nhsr016.pdf. Cited 7 April 2010.
2. Charness, N., Fox, M., & Mitchum, A. (2010). Lifespan cognition and information technology. In K. Fingerman, C. Berg, T. Antonnuci, & J. Smith (Eds.), Handbook of lifespan psychology. New York: Springer.
3. Czaja, S. J., Sharit, J., Charness, N., Fisk, A. D., & Rogers, W. A. (2001). The Center for Research and Education on Aging and Technology Enhancement (CREATE): a program to enhance technology for older adults. Gerontechnology, 1, 50–59.
4. Fisk, A. D., Rogers, W. A., Charness, N., Czaja, S. J., & Sharit, J. (2009). Designing for older adults: Principles and creative human factors approaches (2nd ed.). Boca Raton: CRC Press.
5. Gallup, A. M., & Newport, F. (2007). The Gallup Poll, Public Opinion 2005. Maryland: Rowman & Littlefield, Publishers, Inc.