Yathongchai, W., J. Angskun, and C. Che FUNG. “An Ontology Model for Developing a SQL Personalized Intelligent Tutoring System”. Asian Health, Science and Technology Reports, vol. 25, no. 4, Sept. 2017, pp. 88-96, https://ph03.tci-thaijo.org/index.php/ahstr/article/view/1679.