J.J. Abraham, Lettsom, London 1933, pp. 307, 449 (as by Zoffany)
Brian Green, Around Dulwich, Dulwich Village 1982, pp. 11-12
C.U.M. Smith and Robert Arnott, The genius of Erasmus Darwin, Aldershot 2005, p. 56 (reproduced)
Entry for Dr Joan Coakley Lettsom on the database of the Centre for the Study of the Legacies of British Slavery https://www.ucl.ac.uk/lbs/person/view/2146649667
Entry for Ruth Lettsom on the database of the Centre for the Study of the Legacies of British Slavery https://www.ucl.ac.uk/lbs/person/view/2146649669
Christopher Wright et al., British and Irish paintings in public collections, New Haven and London: Yale University Press for the Paul Mellon Centre for Studies in British Art, 2006, p. 157
Kate Teltscher, 'A guide to the apothecary's garden [review of Clare Hickman, 'The doctor's garden: medicine, science, and horticulture in Britain']', The spectator, 29 January 2022
Zachary Dorner, 'Who cares about care?', The Collation, 13 February 2024, https://www.folger.edu/blogs/collation/who-cares-about-care/