Further reading
Clay, W.L. (1969) The Prison Chaplain: A Memoir of the Rev John Clay, B.D.. Montclair, NJ: Patterson Smith.
Forsythe, B. (2004) ‘Clay, John (1796–1858), prison chaplain’ Oxford Dictionary of National Biography.
Mayhew, H. and Binny, J. (1862) The Criminal Prisons of London and Scenes of Prison Life. London: Griffin, Bihn & Company.