Multi- or interdisciplinary character of the sustainable development theory / Anna JANKOWSKA-KŁAPKOWSKA // W: EUROECO 2000 : holistic concept of training for the promotion of sustainable development focused on European Integration for better quality of environment and human life : international conference : Kraków 15–16\textsuperscript{th} September, 2000 : book of summaries / eds. Aleksandra Wagner, Jan W. Dobrowolski. — Kraków : Wydawnictwo „jak” Andrzej Choczewski, 2000. — S. 18