Cita APA (7th ed.)
ebrary, Inc, Morrow-Howell, N., Hinterlong, J., & Sherraden, M. W. (2001). Productive aging: Concepts and challenges. Johns Hopkins University Press.
Cita Chicago (17th ed.)
ebrary, Inc, Nancy Morrow-Howell, James Hinterlong, i Michael W. Sherraden. Productive Aging: Concepts and Challenges. Baltimore, Md. ; London: Johns Hopkins University Press, 2001.
Cita MLA (9th ed.)
ebrary, Inc, et al. Productive Aging: Concepts and Challenges. Johns Hopkins University Press, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.