1. Bowling, A. (2004). A taxonomy and overview of quality of life. In J. Brown, A. Bowling, & T. Flynn (Eds.), Models of quality of life. FORUM project, European forum on population ageing research, department of sociological studies (pp. 6–77). University of Sheffield: Sheffield.
2. Haywood, K. L., Garratt, A. M., & Fitzpatrick, R. (2005). Quality of life in older people: A structured review of generic-self assessed health instruments. Quality of Life Research, 14, 1651–1668.
3. Turner-Bowker, D. M., Bartley, P. J., & Ware, J. E., Jr. (2002). SF-36 ® health survey & “sf” bibliography: Third edition (1988–2000). Lincoln, RI: Quality Metric Incorporated.
4. Power, M., Quinn, K., Schmidt, S., & WHOQOL Group. (2005). Development of the WHOQOL-old module. Quality of Life Research, 14, 2197–2214.
5. Erikson, R. (1993). Description of inequality: the Swedish approach to welfare research. In M. Nussbaum & A. Sen (Eds.), The quality of life (pp. 67–83). Oxford: Clarendon Press.