By D.A. Cooke, R.K. Scott
By Great Britain: Agricultural, Development and Advisory Service, Great Britain: Ministry of Agriculture, Fisheries and Food
By IAEA
By Gordon Conway
By Alan Major
By James N. Moore, J. Janick, James M. and Janick Moore
By Bruce Schaffer, Peter C. Andersen
By Suman Singha (University of Connecticut, Storrs, CT, USA), Tara Baugher
By Kerry F. Harris (Texas A&M University, College Station, U.S.A.), Oney P. Smith (Hood College, Frederick, Maryland, James E. Duffus (United States Department of Agriculture, Salinas, California)
By Batey, Tom
By Baker, Harry
By Denis J Murphy (, Head of Biotechnology Unit, Division of Biological Sciences, University of Glamorgan, UK)
By R. B. H. Wills, W.B. McGlasson, Douglas Graham, T.H. Less, E.G. Hall
By Food and Agriculture Organization of the United Nations
By W. Holmes
By Geoff Godden
By Hill, Dennis S., Waller, J. M.
By F. Baker, P. Terry
By Richard J. Chancellor
By R.W. Widdowson (Bourne, Lincolnshire, UK)
By Williams, Colin Norman, etc., Uzo, J. O, Peregrine, W.T.H.
By L. R. Humphreys
By James L. Brewster (Horticulture Research International, Wellesbourne, UK)
By S. J. Kays