Best, E. P. H., & Haeck, J. (1983). Ecological indicators for the assessment of the quality of air, water, soil and ecosystems: Papers presented at a symposium held in Utrecht, October 1982. D. Reidel.
Παραπομπή σε μορφή Chicago (17η εκδ.)Best, E. P. H., και J. Haeck. Ecological Indicators for the Assessment of the Quality of Air, Water, Soil and Ecosystems: Papers Presented at a Symposium Held in Utrecht, October 1982. Dordrecht: D. Reidel, 1983.
Παραπομπή σε μορφή MLA (9th εκδ.)Best, E. P. H., και J. Haeck. Ecological Indicators for the Assessment of the Quality of Air, Water, Soil and Ecosystems: Papers Presented at a Symposium Held in Utrecht, October 1982. D. Reidel, 1983.
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