By James L. Brewster (Horticulture Research International, Wellesbourne, UK)
By F.S. Hardy, G.D. Watson
By G. R. Dixon
By Richard J. Chancellor
By Ruck, H.C.
By A. Faniran, O. Areola
By John E. Preece, Paul Read
By John W. Mastalerz
By Roger Balls
By James B. Beard
By Roderick Floud
By P.J. Salter, J.K.A. Bleasdale
By Faith, Nicholas.
By Donald & Petie Kladstrup
By Denis J Murphy (, Head of Biotechnology Unit, Division of Biological Sciences, University of Glamorgan, UK)
By Jonathan Drori, Lucille Clerc
By Mike Dash
By Jonathan Edwards
By Alan Bloom
By Heywood
By Ray Desmond
By Ellis, Derek
By Ian Butterfield, Phillip Cribb
By Adrian Slack
By Orlean, Susan
By Peter Dawson
By Josep G. Canadell, Diane E. Pataki, Louis F. Pitelka
By Drori, Jonathan, Clerc, Lucille