1. Amsterdam Treaty. 1997. “Available At: TREATY OF AMSTERDAM (Europa.eu)” https://europa.eu/european-union/sites/default/files/docs/body/treaty_of_amsterdam_en.pdf
2. Besch, S. 2021. “Bridging the Channel: How Europeans and the UK Can Work Together on Defence Capability Development”. Centre for European Reform. https://www.cer.eu/publications/archive/policy-brief/2021/bridging-channel-how-europeans-and-uk-can-work-together
3. Characterizing the European Union's Strategic Culture: An Analytical Framework