Toonkitjai, S. ., Y. . Chanroung, and S. . Inchai. “The Construction of Reading Skill for Main Idea Exercise Package by Mind Mapping Technique for Prathomsuksa 6 Students of Ban Pa Mai Dang School, Doi Saket District, Chiang Mai Province”. Journal of Graduate Research, vol. 11, no. 1, June 2020, pp. 55-68, https://so02.tci-thaijo.org/index.php/banditvijai/article/view/240074.