Heleni, Susda, et al. “Pembinaan Guru Pembimbing Olimpiade Sains Nasional Bidang Matematika SMA MA Kecamatan Siak”. Jurnal Pendidikan Tambusai, vol. 8, no. 3, Oct. 2024, pp. 44605-13, http://jptam.org/index.php/jptam/article/view/21171.