H. Silber, J. Höhne, and S. Schlosser. Survey Methods: Insights from the Field, (November 2016)http://dx.doi.org/10.13094/SMIF-2016-00006. (Eurobarometer).
Z. Pavlović. European Quarterly of Political Attitudes and Mentalities, 4 (2):
1-11(2015)https://sites.google.com/a/fspub.unibuc.ro/european-quarterly-of-political-attitudes-and-mentalities. (EVS).
D. Repak. European Quarterly of Political Attitudes and Mentalities, 5 (3):
1-16(2016)https://sites.google.com/a/fspub.unibuc.ro/european-quarterly-of-political-attitudes-and-mentalities. (EVS).