Frank, Friedhelm, Gabriele Obermaier, and Nicole Raschke. “Map Draw Competence. Theoretical Basis and the Design of a Competence Model”. Journal of Geography Education 38, no. 3 (September 30, 2010): 191–200. Accessed April 2, 2026. https://zgd-journal.de/index.php/zgd/article/view/182.