1. Watson, R.; Dixon, J.; Hamburg, S.; Janetos, A.; Moss, R.Protecting Our Planet, Securing Our Future;United Nations Environment Programme:Nairobi, Kenya, 1998.
2. Adriaanse, A.; Bringezu, A.; Hamond, Y.; Moriguchi, Y.; Rodenburg, E.; Rogich, D.; Schütz, H.Resource Flows: The Material Base of Industrial Economics;World Resource Institute:Washington, DC, 1997.
3. Matthews, E.; Bringezu, S.; Fischer-Kowalski, M.; Hüttler, W.; Kleijn, R.; Moriguchi, Y.; Ottke, C.; Rodenburg, E.; Rogich, D.; Schandl, H.The Weight of Nations: Material Outflows from Industrial Economics;World Resource Institute:Washington, DC, 2000