1. Scenes from Deep Time
2. The literature of Kent's Cavern, Part III;Pengelly;Transactions of the Devonshire Association for the Advancement of Science, Literature and Art,1871
3. John Traherne, FSA and William Buckland's ‘Red Lady’: An Archaeological Perspective
4. (http://www.devon.gov.uk/localstudies/100143/1.html) – last accessed March 2009
5. The literature of Kent's Cavern, Part I;Pengelly;Transactions of the Devonshire Association for the Advancement of Science, Literature and Art,1868