W. Spohn, M. Koenig, и W. Knöbl. Identities and Modernities in Europe Palgrave Macmillan, Basingstoke, (2015)http://dx.doi.org/10.1057/9780230390775. (Eurobarometer) (EVS) (ISSP).
F. Roosma, W. van Oorschot, и J. Gelissen. International Journal of Public Opinion Research, 28 (3):
376-400(2015)First published online: August 24, 2015, http://dx.doi.org/10.1093/ijpor/edv020 . (ISSP).
A. Constantin, и M. Voicu. Social Indicators Research, 123 (3):
733-751(2015)First published online: September 12, 2014, http://dx.doi.org/10.1007/s11205-014-0758-8. (ISSP).