1. Beck, W., van der Maesen, L., & Walker, A. (1997). The social quality of Europe. The Hague: Kluwer Law International.
2. Berger-Schmitt, R., & Noll, H. H. (2000). Conceptual framework and structure of a European system of social indicators (Euroreporting working paper #9). Mannheim: Centre for Survey Research and Methodology (ZUMA).
3. CPRN discussion paper #F09;P Bernard,1999
4. Bok, D. (2010). The politics of happiness. Princeton, NJ: Princeton University Press.
5. Cummins, R. A. (1997). Assessing quality of life. In R. Brown (Ed.), Quality of life for people with disabilities (pp. 116–150). Cheltenham: Stanley Thornes.