Ciążela, Helena, and Ligia Tuszyńska. “Nature As a Value in Education for Sustainable Development”. Studia Ecologiae et Bioethicae 15, no. 2 (June 30, 2017): 75–83. Accessed May 5, 2024. https://czasopisma.uksw.edu.pl/index.php/seb/article/view/6223.