Lefrida, Rita, Tatag Yuli Eko Siswono, and Agung Lukito. “Development of Derivative Understanding Task Instruments to Explore Student Commognition”. Jurnal Pendidikan Matematika 17, no. 3 (October 14, 2024): 343–360. Accessed November 5, 2024. https://jpm.ejournal.unsri.ac.id/index.php/jpm/article/view/156.