- Konrath, S.H.
- The Power of Philanthropy and Volunteering.
- Huppert, F.A. And Cooper, C.L. "Interventions and Policies to Enhance Wellbeing: A Complete Reference Guide", 2014, John Wiley & Sons, Chapter 11
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no new data on present happiness.