Anisa, F. ., and Z. Dewina. “Cooperative Type Snowball Throwing and Inquiry: A Comparing the Two Opposite Models in Science Learning”. Jurnal Inovasi Pendidikan Dasar, vol. 3, no. 1, Nov. 2017, pp. 23-30, https://journal.uhamka.ac.id/index.php/jipd/article/view/8630.