SpringerLink (Online service), Mollenkopf, H., & Walker, A. (2007). Quality of Life in Old Age: International and Multi-Disciplinary Perspectives. Springer Netherlands.
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Heidrun Mollenkopf, και Alan Walker. Quality of Life in Old Age: International and Multi-Disciplinary Perspectives. Dordrecht: Springer Netherlands, 2007.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Quality of Life in Old Age: International and Multi-Disciplinary Perspectives. Springer Netherlands, 2007.
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