By Gallagher, Belinda
By Adam Hart-Davis
By DK
By Rovelli, Carlo, Segre, Erica, Carnell, Simon
By Tucker, Nicholas
By Waldman, Carl, Braun, Molly
By Unknown, Encyclopaedia Britannica
By Farshtey, Gregory, Lipkowitz, Daniel, Hugo, Simon
By Vorderman, Carol
By Various
By Svehla, G.
By Betty Zed
By Furniss, Tim, McTavish, Douglas, Taylor, Ron
By dorling-kindersley
By Morgan, Prof Kenneth, Corbishley, Mike, Gillingham, John, Kelly, Rosemary, Dawson, Ian, Mason, James
By Rough Guides
By Kennedy, Angus, Rough Guides
By Miles Kelly
By Civardi, Anne
By Bingham, Caroline, Dorling Kindersley
By Krafft, Maurice, etc.
By Green, Dr Jen, Macdonald, Fiona, et al
By Unknown
By Burnie, David