By Crofton, Ian
By Youngson, R.M.
By Carpenter, Clive
By Henley, Darren, Lihoreau, Tim
By Encyclopaedia Britannica
By Dell, W.R.
By Schoelkopf, Dean H.
By Sommerville, James
By Anon
By Daume, Daphne, Davis, J. E.
By Calhoun, D.
By Calhoun, David R (Associate Editor).
By Longman
By DK
By Stoppard, Dr Miriam
By Adam Hart Davis
By Lipscombe, Dr Susan
By Campbell, Donald
By Goldstack, Gaby