George Wilkes, Britain's failure to enter the European community 1961–63: the enlargement negotiations and crises in European, Atlantic and Commonwealth relations (1997) [1]Archived 26 May 2016 at the Wayback Machine p. 63 online
Betts, Lewis David (3 April 2018). "Harold Macmillan and appeasement: implications for the future study of Macmillan as a foreign policy actor". Contemporary British History. 32 (2): 169–189. doi:10.1080/13619462.2017.1401475. ISSN1361-9462. S2CID148757056.
Richard Allen Cave, O'Casey, Sean (1880–1964)Archived 8 November 2021 at the Wayback Machine, Oxford Dictionary of National Biography (Oxford University Press, 2004; online edition, January 2008. Retrieved 19 November 2011.
Betts, Lewis David (3 April 2018). "Harold Macmillan and appeasement: implications for the future study of Macmillan as a foreign policy actor". Contemporary British History. 32 (2): 169–189. doi:10.1080/13619462.2017.1401475. ISSN1361-9462. S2CID148757056.
"Harold Macmillan". Archived from the original on 21 March 2015. Retrieved 13 June 2015. Spartacus Educational website biography.
Richard Allen Cave, O'Casey, Sean (1880–1964)Archived 8 November 2021 at the Wayback Machine, Oxford Dictionary of National Biography (Oxford University Press, 2004; online edition, January 2008. Retrieved 19 November 2011.
George Wilkes, Britain's failure to enter the European community 1961–63: the enlargement negotiations and crises in European, Atlantic and Commonwealth relations (1997) [1]Archived 26 May 2016 at the Wayback Machine p. 63 online
"Getty Images". Itnsource.com. Archived from the original on 4 January 2017. Retrieved 21 October 2017.
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Betts, Lewis David (3 April 2018). "Harold Macmillan and appeasement: implications for the future study of Macmillan as a foreign policy actor". Contemporary British History. 32 (2): 169–189. doi:10.1080/13619462.2017.1401475. ISSN1361-9462. S2CID148757056.