Tonra, Wilda Syam, Didi Suryadi, Endang Cahya Mulyaning, and Kusnandi. 2025. “Learning Obstacles and the Didactical Design for Teaching the Limit of Function in a Calculus Course”. Journal on Mathematics Education 16 (1):153-72. https://doi.org/10.22342/jme.v16i1.pp153-172.