Nafis MD, Darmawan P. Analisa Faktor Penyebab Kesulitan Belajar Matematika Siswa Kelas IX di MTs Shifa’ Kalipare. VENN [Internet]. 2025 Feb. 1 [cited 2026 Oct. 7];4(1):1-7. Available from: https://journal.web.id/journals/venn/article/view/213