By McGavin, George C., Simpson, Stephen J.
By Deborah Underwood
By Andrew Davies
By Sarah Wyndham Lewis
By Royston, Angela
By Greg Pyres
By Barbara Taylor
By Sally Morgan
By Chinery, Michael
By Green, Dr Jen
By Goodden, Robert
By Goater, Barry, Reichholf-Rehm, Helgard, Thomas, Jeremy
By Migdoll, Ivor
By Linssen, E.F.
By Agosti, Donat, etc., Majer, Jonathan D., Alonso, Leeanne E., Schultz, Ted R., Wilson, Edward O.
By Dorling Kindersley
By Martin Townsend, Paul Waring, Richard Lewington
By Jonson, Ben, Donaldson, Ian
By Horowitz, Alexandra
By Walters, Martin
By Shepherd, Allan, Gallant, Suzanne
By Imes, Rick
By Pat Clay, Helen Clay
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 Stanley D. Beck
By Millie Marotta
By Paul Hillyard