Aprilia, Deni, Ena Suhena Praja, and Muhammad Subali Noto. “Desain Bahan Ajar Lingkaran Berbasis Koneksi Matematis Siswa SMP”. Union: Jurnal Ilmiah Pendidikan Matematika 6, no. 1 (February 13, 2018). Accessed October 2, 2023. https://jurnal.ustjogja.ac.id/index.php/union/article/view/1547.