1. The National Archives (TNA), Kew, TNA
2. Documents on British Policy Overseas (DBPO), Series II, Vol. II, The London Conferences, January–June 1950 (1987)
3. Foreign Relations of the United States (FRUS), 1948, 1950, 1951, 1964–1968 (Washington, DC: Government Printing Office)
4. North Atlantic Treaty is available at https://www.nato.int/cps/en/natohq/official_texts_17120.htm (last accessed 22 February 2021)
5. Archivio storico-diplomatico del Ministero degli Affari Esteri e della Cooperazione internazionale (ASDMAE), Rome, Italy. Fondi: Gabinetto del Ministro (1953–1961) and (1961–1963).