1. Vital Statistics, a Memorial Volume of Selections from the Reports and Writings of William Farr, London: Sanitary Institute, 1885: xi. (Reprinted New York: Scarecrow Press, 1975)
2. Weatherall M, describes Heberden's work in Cambridge Contributions, Medical Science. Cambridge: Cambridge University Press, 1997: 28–9
3. Dictionary of National Biography. Oxford: Oxford University Press, 1964: vol. VI, p. 1090
4. Parliamentary Papers, 1846: vol. 10, p. 651, Chadwick's evidence
5. JoSeph William Bazalgette (1819–1891): A Major Figure in the Health Improvements of Victorian London