Hamdani, Deni, Purwanto, Sukoriyanto, and Lathiful Anwar. “Causes of Proof Construction Failure in Proof by Contradiction”. Journal on Mathematics Education 14, no. 3 (June 9, 2023): 415–448. Accessed November 22, 2024. http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/308.