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.