Aprilia D, Praja ES, Noto MS. Desain Bahan Ajar Lingkaran Berbasis Koneksi Matematis Siswa SMP. Union J. Ilm. Pendidik. Mat. [Internet]. 2018 Feb. 13 [cited 2023 Sep. 30];6(1). Available from: https://jurnal.ustjogja.ac.id/index.php/union/article/view/1547