Frisnoiry, Suci, et al. “Kemampuan Penalaran Siswa Kelas VII-4 SMPN 35 Medan Melalui Model Pembelajaran Matematika Realistic (PMR)”. Innovative: Journal Of Social Science Research, vol. 3, no. 2, June 2023, pp. 9913-27, http://j-innovative.org/index.php/Innovative/article/view/1564.