by The World Commission on Environment and Development.
by Ghose S. N.
by Srivastava H. C.
by Muniraj R.
by Seetharaman S. P.
by Khan, Emdad.
by Prosser J.I.
by Brown C.M.
by Oxford UniversityPress.
by Glover D. M.
by Darley Usmar V. M.
by Mantell S. H.
by Roberts D.B.
by Shell K.
by Mulders M. A.
by Whiteman P.C.
by Balogh J.
by Srivastava U. K.
by Petr J.V. Cerny.
by Berry Ralph.
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