Mackenzie 1918, p. 120. Mackenzie, Robert (1918). John Brown of Haddington. London, New York: Hodder and Stoughton. Retrieved 29 September 2018. This article incorporates text from this source, which is in the public domain.
Cairns 1860, p. 2-3. Cairns, John (1860). Memoir of John Brown. Edinburgh: Published for T. Constable by Edmonston and Douglas. pp. 2–3. Retrieved 20 April 2019.