APRILIA, D.; PRAJA, E. S.; NOTO, M. S. Desain Bahan Ajar Lingkaran Berbasis Koneksi Matematis Siswa SMP. Union: Jurnal Ilmiah Pendidikan Matematika, [S. l.], v. 6, n. 1, 2018. DOI: 10.30738/.v6i1.1547. Disponível em: https://jurnal.ustjogja.ac.id/index.php/union/article/view/1547. Acesso em: 2 oct. 2023.