- Veenhoven, R.
- Enjoyment of Life lengthens Life. Findings and Consequences.
- Freire, T.; Ed.: "Understanding Positive Life Research an Practice on Positive Psychology'', Climepsi, 2009, Lisabon, Portugal, 19 - 42
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no new data on present happiness.