- Veenhoven, R.
- Findings on Happiness and Activity Level. (How much one does).
- World Database of Happiness, Collection of Correlational Findings, Finding report A1, 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.