By Dr. D. G. Hessayon
By Agnew, John
By Dani Rodrik
By Pegg, Mike, Drummond, D.
By Humphries, C.J.
By Mabey, Richard
By Somerville, Christopher
By Nick Williams
By Gillman, Michael
By Colling, A.
By The Open University
By Bell, A., Harris, N., Rothery, David A.
By Brown, E., Coe, A., Skelton, P.W., Wilson, C
By D. L. Dineley
By Natural Environment Research Council
By Eric Edmonds
By Mark S. Monmonier, H.J. de Blij
By Black, Jeremymorni
By John Bartholomew and Son
By Brown, Judith M
By Chomsky, Noam
By Mutti, Emiliano, etc., Tinterri, Roberto, Remacha, Eduard, Mavilla, Nicola, Angella, Stefano, Fava, Lluca
By David, C., Le Ravelec-Dupin, M.
By Batist, M.De, Jacobs, P., De Batist, M.
By Nieuwland, D.A.
By Lawson, M., Formolo, M. J., Eiler, J. M.
By Ashcroft, WILLIAM
By Cunningham, W. D., Mann, P.
By Coward, M.P., etc., Daltaban, S., Johnson H
By R. Chris L. Wilson, Fiona M. Hyden, Angela L. Coe