Pavlátová, Věra, and Roman Kroufek. “Teachers’ View of the Difficulty of Selected Environmental Concepts in Primary School Textbooks”. Scientia in educatione 9, no. 2 (December 31, 2018): 57–79. Accessed July 17, 2025. https://www.ojs.cuni.cz/scied/article/view/1012.