1. Birren, J. E., & Birren, B. A. (1990). The concepts, models, and history of the psychology of aging. In J. E. Birren & K. W. Schaie (Eds.), Handbook of the psychology of aging (pp. 3–20). San Diego: Academic Press.
2. Birren, J. E., Kenyon, G. M., Ruth, J., Schroots, J. J. F., & Svensson, T. (Eds.). (1996). Aging and biography: Explorations in adult development. New York: Springer.
3. Birren, J. E., & Schroots, J. J. F. (1996). History, concepts, and theory in the psychology of aging. In J. E. Birren, K. W. Schaie, R. P. Abeles, M. Gatz, & T. A. Salthouse (Eds.), Handbook of the psychology of aging (4th ed., pp. 3–23). San Diego, CA: Academic Press.
4. Fitzgerald J. M. 1981. Research methods and research questions for the study of person perception in adult development. Human Development 242 138–144
5. Keith, J. (1990). Age in social and cultural context: Anthropological perspectives. In R. H. Binstock & L. K. George (Eds.), Handbook of aging and the social sciences (3rd ed., pp. 91–111). San Diego, CA: Academic Press.