- Bultena, G.L.; Powers, E.A.
- Effects of Age-Grade, Comparison on Adjustment in Later Life.
- Gubrium, J.F.(Ed).: "Time, Roles and Self in Old Age", Human Sciences Press, 1976, New York, USA, 165 - 178
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no valid measure of happiness used.