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): sid. 169–189. doi:10.1080/13619462.2017.1401475. ISSN1361-9462.
Richard Allen Cave, O'Casey, Sean (1880–1964)Arkiverad 8 November 2021, Oxford Dictionary of National Biography (Oxford University Press, 2004; online edition, January 2008. Retrieved 19 November 2011.
Richard Allen Cave, O'Casey, Sean (1880–1964)Arkiverad 8 November 2021, 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): sid. 169–189. doi:10.1080/13619462.2017.1401475. ISSN1361-9462.