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Holyoake, George Jacob (1906). Sixty Years of an Agitator's Life. 6th impression. London: T. Fisher Unwin.

Royle, Edward (1972). Victorian Infidels: the origins of the British secularist movement, 1791-1866. Manchester: Manchester University Press.

Royle, Edward (ed.) (1976). The Infidel Tradition: from Paine to Bradlaugh. London: Macmillan.

Stein, Gordon (1985). "Southwell, Charles." The Encyclopedia of Unbelief, Vol. II, pp. 636-637. Buffalo, New York: Prometheus Books.

The Oracle of Reason, Volume 1

"Collection of periodicals on religion, radicalism and freethought, 1834-1916", Contents of the microfilm collection with an introduction by Dr. Edward Royle, Microform Academic Publishers.