Ramadhani, K., and Y. Hasan. “MENINGKATKAN KEMAMPUAN MENYUSUN KALIMAT MELALUI MODEL PEMBELAJARAN SNOWBALL THROWING”. Ranah Research : Journal of Multidisciplinary Research and Development, Vol. 1, no. 4, Aug. 2019, pp. 1106 -13, https://jurnal.ranahresearch.com/index.php/R2J/article/view/177.