3Ademan,M.A.,Harindar De Silva,and Michael F.Koeln.1988."User Cost in Oil Production".Resouroes and Energy.13:21240.
4Ahmad,Y.J.,S.E1.Serafy and E.Lutz(eds)1989.Environmental Accounting for Sustainable Development.The World Bank:Washington,D.C.
5Bartelmus,P.,1996."The Value of Nature:Valuation and Evaluation in Environmental Accounting".Paper presented at the International Symposium on Integrated Environmental and Economic Accounting in Theory and Practice,Tokyo,Japan,5-8 March.