1. Rand, A.B. (2009, June 1). Where we stand: Leading to the future. AARP Bulletin.
2. AARP. (n.d.). Staying sharp program. Staying sharp: Understanding & maintaining your brain. Retrieved July 14, 2010 from http://www.aarp.org/about-aarp/nrta/info-2005/understand_maintain_brain.html