Siregar, A. R., N. H. Matondang, and W. Rajagukguk. “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.