
https://ec.europa.eu/research/evaluations/pdf/archive/other_reports_studies_and_documents/hlg_2017_report.pdf

https://www.newstatesman.com/ideas/2021/02/what-does-it-mean-be-pro-european-today?mc_cid=4118481f79&mc_eid=286ad5ef5f

http://www.tilisone.net/wp-content/uploads/2017/10/APuZ_2017-38-39_online-1.pdf