1. Braddon Elizabeth (1998) Lady Audley's Secret. Ed. David Skilton. Oxford: Oxford University Press.
2. Chesler, Phyllis (2005) Women and Madness. New York: Palgrave Macmillan.
3. Combe, George (1819) Essays on Phrenology; or an Inquiry into the Principles and Ability of the System of Drs Gall and Spurzheim; and into the Objections Made Against It. Edinburgh.
4. Combe, George (nd) 1819-1920 Notebooks. NLS7406, fo. 72–73.
5. Combe, George (1974) The Constitution of Man in Relation to External Objects. Delmar: Scholars' Facsimiles & Reprints.