Najidah Osman, Nor, and Nurfaradilla Mohamad Nasri. “Mastery Level of Higher – Order Thinking Skills (HOTS) High School Students in Mathematical Learning: Systematic Literature Survey”. International Journal of Academic Research in Progressive Education and Development 12, no. 1 (February 21, 2023). Accessed October 8, 2025. https://ijarped.com/index.php/journal/article/view/1441.