- Veenhoven, R.
- Quality of Life (QoL), an Overview
- Alex C. Michalos (Ed.) Encyclopedia of Quality of Life and Well-Being Research, 2014, Springer, Dordrecht, Netherlands, Springer Reference Series, 5265 - 5269
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no new data on present happiness.