D. Brady, S. Marquardt, G. Gauchat, и M. Reynolds. Journal of Health Politics Policy and Law, 41 (3):
355-392(2016)First published online: February 26, 2016, http://dx.doi.org/10.1215/03616878-3523946. (ISSP).
M. Fernández-Alonso, и A. Jaime-Castillo. International Sociology, 31 (1):
37-56(2016)First published online: November 13, 2015. http://dx.doi.org/10.1177/0268580915613192. (ISSP).
A. Ceobanu, и T. Koropeckyj-Cox. Population Research and Policy Review, 32 (2):
261--284(2013)First published online: October 19, 2012. http://dx.doi.org/10.1007/s11113-012-9260-7. (Eurobarometer).