By Nicholaas Biegman
By Robert Wilkinson-Latham, Michael Roffe
By Daoud Hari
By Dr Douglas H Johnson
By Alun Buffry
By Jason Goodwin
By Roy MacLeod
By Max Rodenbeck
By Jonathan Dimbleby
By Paul G. Bahn
By Nigel Strudwick, Helen M. Strudwick
By Janice Boddy
By Dave Lande
By Vincent Boele
By Astrid Madimba, Chinny Ukata
By David Robinson (Michigan State University)
By lise manniche
By Tarek Osman
By Donald Featherstone
By Jon E. Lewis
By Henissart, Paul
By Siliotti, Alberto
By Shafer, Byron E.
By Halliwell, Sarah.
By Filer, Joyce
By Willis, Michael J.
By Martinez, Luis, Boserup, Rasmus
By Beler, Aude Gros de
By Holland, James
By Ewald, Janet J