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2. De Groot, W.T.: Environmental Science Theory, Concepts and methods in a one-world, problem-oriented paradigm, ISBN 0-444-88993-0, Elsevier Amsterdam (NL), 1992
3. Frischknecht, R., P. Hofstetter, I. Knoepfel, R. Dones, E. Zollinger: Ökoinventare für Energiesysteme, ETH & PSI (CH), März 1994
4. Heijungs, R., J. Guinee, G. Huppes, R. M. Lankreijer, H.A. Udo De Haesi.,A. Wegener-Sieeswijk, A.M.M. Ansems, P.G. Eggles, R. Van Duin, H.P. De Goede: Life Cycle Analysis of products, Manual and Backgrounds, CML, TNO, B&G (NL), October 1992
5. Hester, R.E.,R.E. Harrison (ed): Mining and its Environmental Impact, Royal Society of Chemistry, 1994