Lara B. Aknin, Christopher P. Barrington-Leigh, Elizabeth W. Dunn, John F. Helliwell, Justine Burns, Robert Biswas-Diener, Imelda Kemeza, Paul Nyende, Claire E. Ashton-James, Michael I. Norton,
Prosocial Spending and Well-Being: Cross-Cultural Evidence for a Psychological Universal Journal of Personality and Social Psychology. ,vol. 104, pp. 635- 652 ,(2013) ,
10.1037/A0031578