Mahrudi, M., and A. Rahman. “Improving Students Activity and Students Mathematic Learning Outcomes by Using Two Stay Two Stray Model”. Jurnal Axioma : Jurnal Matematika Dan Pembelajaran, vol. 2, no. 1, Jan. 2017, pp. 1-13, https://ejurnal.uij.ac.id/index.php/AXI/article/view/282.