Rahayu, R., and F. Fatmawati. “Meningkatkan Kemampuan Interaksi Sosial Terhadap Siswa Kesulitan Belajar Matematika Melalui Metode Tutor Sebaya”. Ranah Research : Journal of Multidisciplinary Research and Development, Vol. 2, no. 2, Jan. 2020, pp. 18-28, https://jurnal.ranahresearch.com/index.php/R2J/article/view/223.