https://www.alter-eu.org/press-releases/2018/02/20-0
http://www.pewglobal.org/2017/06/15/post-brexit-europeans-more-favorable-toward-eu/?cmpid=BBBXT061617_BIZ&utm_medium=email&utm_source=newsletter&utm
https://www.ilblogdellestelle.it/2020/02/la-mafia-va-contrastata-a-livello-europeo.html
https://www.sciencespo.fr/cevipof/sites/sciencespo.fr.cevipof/files/CEPR-DP13103.pdf