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, vol. 12, no. 1, Feb. 2023, https://ijarped.com/index.php/journal/article/view/1441.