A. Pitiwong, S. Tuntiwongwanich, and K. Kiddee, “THE DEVELOPMENT OF PROGRAMMING SKILLS WITH PLOBLEM-BASED LEARNING METHOD TOGETHER WITH E-LEARNING COURSEWARE ON SELECTION STRUCTURE PROGRAMMING FOR GRADE 7 STUDENTS”, J. IND. EDUC., vol. 19, no. 2, pp. 20–29, Sep. 2020.