Sudirman, Sudirman, dan Bambang Avip Priatna Martadiputra. “Exploratory Case Study Difficulty of Junior High School Students in Resolving Problems of the Pyramids Surface Area”. Math Didactic: Jurnal Pendidikan Matematika 6, no. 3 (Desember 2, 2020): 277-286. Diakses Juli 7, 2025. https://jurnal.stkipbjm.ac.id/index.php/math/article/view/1131.