Convention on Long-Range Transboundary Air Pollution & International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests. (1992). Forest condition in Europe: 1992 executive report. United Nations Economic Commission for Europe, Commission of the European Comminities.
Παραπομπή σε μορφή Chicago (17η εκδ.)Convention on Long-Range Transboundary Air Pollution και International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests. Forest Condition in Europe: 1992 Executive Report. Brussels; Geneva: United Nations Economic Commission for Europe, Commission of the European Comminities, 1992.
Παραπομπή σε μορφή MLA (9th εκδ.)Convention on Long-Range Transboundary Air Pollution και International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests. Forest Condition in Europe: 1992 Executive Report. United Nations Economic Commission for Europe, Commission of the European Comminities, 1992.