- Dickerhoof, R.
- Expressing Optimism and Gratitude: A Longitudinal Investigation of Cognitive Strategies to Increase Well-Being.
- A Dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy, Riverside, 2007, 1 - 25, California, USA
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no valid measure of happiness used.