- Brummett, B.H.; Babyak, M.A.; Barefoot, J.C.
- Positive Emotion is Associated with 6-year Change in Functional Status in Individuals Aged 60 and Older
- The Journal of Positive Psychology, Vol. 6, 216-223,
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no valid measure of happiness used.