Mentioned in a 1925 letter to Mitchison, quoted in her autobiography You May Well Ask: A Memoir 1920–1940. Mitchison, Naomi (1986) [1979]. "11: Morgan Comes to Tea". You May Well Ask: A Memoir 1920-1940. London: Fontana Paperbacks. ISBN978-0-00654-193-6.
Stape, J H (18 December 1992). E. M. Forster. Palgrave Macmillan UK. p. 79. ISBN978-1-349-12850-1. Archived from the original on 21 April 2017. Retrieved 20 April 2017.
David Bradshaw, ed. (2007). "Chronology". The Cambridge Companion to E. M. Forster. Cambridge University Press. ISBN978-0-521-83475-9. Retrieved 27 May 2008.
Stape, J H (18 December 1992). E. M. Forster. Palgrave Macmillan UK. p. 79. ISBN978-1-349-12850-1. Archived from the original on 21 April 2017. Retrieved 20 April 2017.