Činčera, Jan, Jiří Kulich, and Dita Gollová. “Effectiveness, Evaluation and Support for Environmental Education Programmes”. Envigogika 4, no. 2 (September 30, 2009). Accessed July 22, 2019. https://www.envigogika.cuni.cz/index.php/Envigogika/article/view/39.