Z. Pavlović. European Quarterly of Political Attitudes and Mentalities, 5 (3):
41-55(2016)https://sites.google.com/a/fspub.unibuc.ro/european-quarterly-of-political-attitudes-and-mentalities. (EVS).
J. Cullis, J. Hudson, und P. Jones. Journal of Happiness Studies, 12 (2):
323-341(2011)First published online: March 3, 2010, http://dx.doi.org/10.1007/s10902-010-9190-1. (Eurobarometer).