Bialystok,E. & Craik, F.I.M. (2006). Lifespan cognition:Mechanisms of change. New York: Oxford Univeristy Press.

Cavanaugh, J.C.(1990). Adult development and aging. Belmont, CA: Wadsworth Publishing Co.

Hoyer, W.J., Rybash, J.M., & Roodin, P.A. (1999). Adult development and aging. Boston: McGraw-Hill College.

Rybash, J.M., Rodin, P.A., & Hoyer, W.J. (1995). Adult development and aging. Dubuque,IA: Brown & Benchmark Publishers.