1. Lisbon European Council 23 and 24 March 2000
https://www.europarl.europa.eu/summits/lis1_en.htm
2. Communication from the Commission
https://ec.europa.eu/eu2020/pdf/COMPLET%20EN%20BARROSO%20%20%20007%20-%20Europe%202020%20-%20EN%20version.pdf
3. Communication from the Commission
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=COM%3A2019%3A640%3AFIN
4. A Union that Strives for More. My Agenda for Europe. By Candidate for President of the European Commission Ursula von der Leyen: Political Guidelines for the Next European Commission 2019–2024
https://ec.europa.eu/info/sites/default/files/political-guidelines-next-commission_en_0.pdf