William Shakespeare (2013). “The Wars of the Roses In Plain and Simple English: Includes Henry VI Parts 1 - 3 & Richard III, Richard II, Henry IV Parts 1 and 2, and Henry V”, p.854, BookCaps Study Guides
Charles Babbage, Peter Mark Roget (1989). “Reflections on the decline of science in England and on some of its causes: with a new appendix of correspondence by Charles Babbage & Peter M. Roget from the Philosophical magazine”