William Adam: The Gem of the Peak; or Matlock Bath and its vicinity; an account of Derby; a tour from Derby to Matlock: ... a review of the geology of Derbyshire; catalogue of minerals and rocks, and of the flora of the high and low Peak. J. & C. Mozley, 1857, S.238– (google.com [abgerufen am 28. September 2012]).
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Steve Hollyman and Gary Kelsall: The Legend of the Chained Oak. Alton Towers Heritage, 2008, archiviert vom Original am 30. April 2013; abgerufen am 28. September 2012.
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Steve Hollyman and Gary Kelsall: The Legend of the Chained Oak. Alton Towers Heritage, 2008, archiviert vom Original am 30. April 2013; abgerufen am 28. September 2012.