WOLTER , Edyta. Education for environmental protection on the foundation of the value of truth, kindness, beauty and ecological values. Kwartalnik Naukowy Fides et Ratio, [S. l.], v. 36, n. 4, p. 238–252, 2018. Disponível em: https://fidesetratio.com.pl/ojs/index.php/FetR/article/view/490. Acesso em: 29 dec. 2025.