- Veenhoven, R.
- Findings on Happiness and Activity Level. ( What one does).
- World Database of Happiness, Collection of Correlational Findings, Finding report A2, Erasmus University Rotterdam, the Netherlands, Printout 2009, http://worlddatabaseofhappiness.eur.nl.
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no new data on present happiness.