Wahl, H., Brenner, H., Mollenkopf, H., Rothenbacher, D., & Rott, C. (2006). The Many Faces of Health, Competence and Well-Being in Old Age: Integrating Epidemiological, Psychological and Social Perspectives. Springer Netherlands. https://doi.org/10.1007/1-4020-4138-1

Wahl, Hans-Werner, Hermann Brenner, Heidrun Mollenkopf, Dietrich Rothenbacher, and Christoph Rott. The Many Faces of Health, Competence and Well-Being in Old Age: Integrating Epidemiological, Psychological and Social Perspectives. Dordrecht: Springer Netherlands, 2006. https://doi.org/10.1007/1-4020-4138-1.

Wahl, Hans-Werner, et al. The Many Faces of Health, Competence and Well-Being in Old Age: Integrating Epidemiological, Psychological and Social Perspectives. Springer Netherlands, 2006. https://doi.org/10.1007/1-4020-4138-1.