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APA Citation
Freund, A. M., Hennecke, M., Brandstätter, V., Martin, M., Boker, S. M., Charles, S. T., Fishbach, A., Hess, T. M., Heckhausen, J., Gow, A. J., Isaacowitz, D. M., Klusmann, V., Lachman, M. E., Mayr, U., Oettingen, G., Robert, P., Röcke, C., Rothermund, K., Scholz, U., Tobler, P. N., Zacher, H., & Zadeh, R. S. (n.d.). motivation and Healthy Aging: A Heuristic Model. Journals of gerontology, 76, S97–S104. http://access.bl.uk/ark:/81055/vdc_100140625908.0x00003f