
https://openknowledge.worldbank.org/bitstream/handle/10986/38045/9781464819025.pdf?sequence=5&isAllowed=y

https://www.prospectmagazine.co.uk/arts-and-books/spanish-legion-viral-tweet-twitter-history

https://ec.europa.eu/info/sites/default/files/joint_communication_-_defence_investment_gaps_analysis_and_way_forward_0.pdf