- Proyer, R.T.; Gander, F.; Ruch, W.
- Toward a Better Understanding of What Makes Positive Psychology Interventions Work: Predicting Happiness and Depression From the Person × Intervention Fit in a Follow-Up after 3.5 Years.
- Applied Psychology; Health and Well-Being, 2015, Vol. 7, 108 - 128
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no valid measure of happiness used.