Siregar, Ahmad Rifai, et al. “TREN PENELITIAN TESIS S2 PENDIDIKAN MATEMATIKA UNIVERSITAS NEGERI MEDAN: KAJIAN SISTEMATIS 2020-2023”. Jurnal Ilmiah Widya Pustaka Pendidikan, vol. 12, no. 1, June 2024, pp. 38-50, https://jiwpp.unram.ac.id/index.php/widya/article/view/150.