Cita APA (7a ed.)

Kelly, J. R., & Kelly, J. R. (1993). Activity and aging: Staying involved in later life. Sage focus editions.

Cita Chicago Style (17a ed.)

Kelly, John Robert, y John R. Kelly. "Activity and Aging: Staying Involved in Later Life." Sage Focus Editions 1993.

Cita MLA (9a ed.)

Kelly, John Robert, y John R. Kelly. "Activity and Aging: Staying Involved in Later Life." Sage Focus Editions, 1993.