By David Thomas, David George Bowers
By Peter J. Taylor
By Stephen Jay Gould
By Philip C. Kissam, Late Professor Emeritus
By Not Cited, No Author.
By Robert Potter, Tony Binns, Jennifer Elliott, Etienne Nel, David Smith
By Robert B. Potter, David Barker, Thomas Klak, Denis Conway
By Robert B. Potter, Dennis Conway, Joan A. Phillips
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By Hattatt, Lance
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By Heinzel, HERMANN, Fitter, R. S. R., Parslow, John
By Shelton, David.
By Charlotte Haslam
By Hissey, Jane, Hissey, Jane, Ian Moffitt and the editors of time life boks
By R. Ison, C. Blackmore, D. Morris
By C. Blackmore, A. Berardi
By Open University Course Team
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