5T. E. Graedel, B.R. Allenby. Industrial Ecology,Prentice Hall, New Jersey, 1995.
6R. U. Ayres. lndsutrial metabolism:theory and Policy, The Greening of Industrial Ecosystems, Editors:B. R. Allenby, D. J. Richard, National Academy Press, 2001.
7Her. Living in the Environment. Wasaworth,1996.
8S. Schmidheiny, Eco - efficiency, MIT Press, 1992.
9Young, J. E et al. Creating a sustainable materials economy. State of the World, 1995.
10Federal Minister for the Environment, Tomards Sustainable Development in Germany, Government of the Federal Republic of Germany, 1997.
