Arumningsih, Eys. “Profile of Numeration Ability in Solving Trigonometry Questions in Class X Smk 4 Semarang Examined by Initial Mathematical Ability”. Jurnal THEOREMS (The Original Research of Mathematics) 9, no. 1 (July 29, 2024): 182–197. Accessed May 17, 2025. https://www.ejournal.unma.ac.id/index.php/th/article/view/10079.