Cleal, Christopher J.; Lazarus, Maureen; Townsend, Annette (2005). "Illustrations and illustrators during the 'Golden Age' of palaeobotany: 1800–1840". In Bowden, A. J.; Burek, C. V.; Wilding, R. (eds.). History of palaeobotany : selected essays. London: Geological Society of London. p. 41. பன்னாட்டுத் தரப்புத்தக எண்9781862391741.
