By OUP
By Illes, Judika
By Slavin, Bill, Jim
By Somerville, James
By Cox, Jennifer, Trier, Jean
By Carley, James P
By John Farndon, Farndon, John
By Little, Kate
By Adrienne Jack, Jack, Adrienne
By Encyclopaedia Britannica
By Tatchell, J, Robson, Kirsteen
By Miles Kelly
By Crofton, Ian
By Rowen, Beth, Slepian, Curtis
By Ayto, John
By Isaacs, Alan
By National Geographic
By Firth, Lesley
By Coote, Roger
By Neil Ardley, neil-ardley
By Allaby, M.
By Unknown
By Treays, Rebecca
By Corbishley, Mike