Ahmad Tarmizi, and H. Hidayat. “PENGEMBANGAN BAHAN AJAR BERBASIS PROBLEM BASED LEARNING PADA MATERI BILANGAN BULAT”. Jurnal Cakrawala Ilmiah, vol. 4, no. 8, Apr. 2025, pp. 1229-34, https://mail.bajangjournal.com/index.php/JCI/article/view/10246.