Siahaan TM, Pane EP, Sidabutar R, Sauduran GN. Development of Integral Calculus Teaching Materials to Improve Mathematical Reasoning Ability of Mathematics Education Students at HKBP Nommensen Pematangsiantar University. edu [Internet]. 2023 Jan. 2 [cited 2026 Aug. 7];4(1):133-45. Available from: https://mail.edunesia.org/edu/article/view/322