YANI; PAMUNGKAS, Dwi; RAHARJA, Surya Putra. Analisis Kesulitan Belajar Peserta Didik dalam Operasi Perkalian di SMP Negeri 9 Kota Sorong. Jurnal Pembangunan Pendidikan Indonesia, Malang, Indonesia, v. 2, n. 1, p. 50–57, 2026. DOI: 10.70214/9qy4xj06. Disponível em: https://ejournal.suryabuanaconsulting.com/index.php/jppi/article/view/328. Acesso em: 21 oct. 2026.