PAVLÁTOVÁ, Věra; KROUFEK, Roman. Teachers’ View of the Difficulty of Selected Environmental Concepts in Primary School Textbooks. Scientia in educatione, [S. l.], v. 9, n. 2, p. 57–79, 2018. DOI: 10.14712/18047106.1012. Disponível em: https://ojs.cuni.cz/scied/article/view/1012. Acesso em: 16 jun. 2025.