TOMKOVÁ, V., & BÁNESZ, G. (2015). Program Development of Spatial Imagination of Pupils of Lower Secondary Education in the Slovak Republic. Journal of Education, Technology and Computer Science, ISSN 2719-6550, e-ISSN 2719-7417, 11(1), 32–37. Retrieved from https://journals.ur.edu.pl/jetacomps/article/view/6520