Sitanggang, Derma. “Analisis Kesulitan Siswa Memahami Konsep, Prinsip, Dan Prosedur Pada Soal-Soal Materi Garis Dan Sudut”. Journal of Student Research 2, no. 2 (January 26, 2024): 31–46. Accessed November 7, 2024. https://ejurnal.stie-trianandra.ac.id/index.php/jsr/article/view/2752.