LAPUH, Barbara; SELAN, Jurij. Uporaba prostorskih ključev pri učencih osmega razreda osnovne šole. Journal of Elementary Education, [S. l.], v. 11, n. 2, p. 121–142, 2018. Disponível em: https://old.journals.um.si/index.php/education/article/view/162. Acesso em: 9 nov. 2025.