Yusuf, Slamet. P. H., Thomas Sukardi , Mohd. Khairudin. “Learning Model Higher Order Thinking Skills at Vocational High School: Achievement and Thinking Behavior”. International Journal of Advanced Science and Technology 29, no. 7s (April 14, 2020): 158 - 170. Accessed February 25, 2026. http://sersc.org/journals/index.php/IJAST/article/view/9424.