Daopa, K. “LOWER SECONDARY SCHOOL STUDENTS’ ATTITUDES TOWARD MATHEMATICS LEARNING MANAGEMENT USING OPEN–APPROACH IN CONJUNCTION WITH JAPANESE TEXTBOOKS”. Journal of Graduate School Sakon Nakhon Rajabhat University, vol. 23, no. 102, Sept. 2026, pp. 568-83, https://so02.tci-thaijo.org/index.php/SNGSJ/article/view/280363.