1. Ferrans, C. E. (2005). Definitions and conceptual models of quality of life. In J. Lipscomb, C. C. Gotay, & C. Synder (Eds.), Outcomes assessment in cancer (pp. 14–30). NY: Cambridge University Press.
2. Hunt, S. M. (1991). The problem of quality of life. Quality of Life Research, 6, 205–226.
3. Nord, E., Arnesen, T., Menzel, P., & Pinto, J.-L. (2001). Towards a more restricted use of the term “quality of life”. News Letter Quality of Life, 26, 3–4.
4. Rapley, M. (2003). Quality of life research. Thousand Oaks, CA: Sage.
5. Editorial. (1995). Quality of life and clinical trials. Lancet, 346(8966), 1–2.