Efektivitas Model Pembelajaran Problem Based Instruction Dan Snowball Throwing Ditinjau Dari Hasil Beljar Matematika Siswa Kelas Viii Smpn 51 Batam. JM [Internet]. 2017 Apr. 2 [cited 2026 Jun. 25];1(2):97-103. Available from: https://ejurnal.mercubuana-yogya.ac.id/index.php/mercumatika/article/view/251