Hemmer, Ingrid, Michael Hemmer, Katja Kruschel, Eva Neidhardt, Gabi Obermaier, and Rainer Uphues. “Influencing Factors of Children’s Spatial Orientation Competence With the Help of a City Map Within a Real Area”. Journal of Geography Education 38, no. 2 (June 30, 2010): 65–76. Accessed April 2, 2026. https://zgd-journal.de/index.php/zgd/article/view/168.