1. Gill TM, Feinstein AR. A critical appraisal of the quality of quality-of-life measurements. JAMA. 1984;272:619–626.
2. Muldoon MF, Barger SD, Flory JD, Manuck SB. What are quality of life measurements measuring? Br Med J. 1998;316:542–545.
3. Schipper H, Clinch J, Powell V. Definitions and Conceptual Issues. In Spilker B, ed. Quality of Life Assessments in Clinical Trials. New York, NY: Raven Press; 1990.
4. Stone AA, Turkkan JS, Bachrach CA, Jobe JB, Kurtman HS, Cain VS. The Science of Self Report: Implications for Research and Practice. Mahwah, NJ: Lawrence Erlbaum Associates; 2000.
5. Bradburn NM. Temporal Representation and Event Dating. In Stone AA, et al, eds. The Science of Self Report: Implications for Research and Practice. Mahwah, NJ: Lawrence Erlbaum Associates; 2000.