Reinfried, Sibylle, Benno Rottermann, Urs Aeschbacher, and Erich Huber. “Efficacy of a Constructivist Learning Environment on Secondary Students’ Connections of the Greenhouse Effect and Global Warming – A Pilot Study”. Journal of Geography Education 38, no. 4 (December 31, 2010): 218–239. Accessed May 18, 2026. https://www.zgd-journal.de/index.php/zgd/article/view/174.