Παραπομπή APA
Leffland, K., Kaersgaard, H., & European Environment Agency. (1998). Comparing environmental impact data on cleaner technologies. Λουξεμβούργο: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleLeffland, Karen., Henrik Kaersgaard, and European Environment Agency. Comparing Environmental Impact Data On Cleaner Technologies. Λουξεμβούργο: Office for Official Publications of the European Communities, 1998.
Παραπομπή MLALeffland, Karen., Henrik Kaersgaard, and European Environment Agency. Comparing Environmental Impact Data On Cleaner Technologies. Λουξεμβούργο: Office for Official Publications of the European Communities, 1998.
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