MERY ANDANI; JAMILAH; HARTONO. DIDACTICAL OBSTACLE SISWA KELAS IX PADA MATERI DERET GEOMETRI . Journal of Innovation Research and Knowledge, [S. l.], v. 1, n. 5, p. 887–894, 2021. DOI: 10.53625/jirk.v1i5.482. Disponível em: https://mail.bajangjournal.com/index.php/JIRK/article/view/482. Acesso em: 5 jul. 2025.