Nasrulloh, Muhammad Farid, et al. “Metode Tutor Sebaya Terhadap Hasil Belajar Kognitif Matematika Siswa Madrasah Aliyah Kelas X”. JoEMS : Journal of Education and Management Studies, vol. 2, no. 1, Feb. 2019, pp. 7-14, https://ojs.unwaha.ac.id/index.php/joems/article/view/51.