Posawang, Rujila, and Wanida Promkhet. “A COMPARISON OF LEARNING ACHIEVEMENT BEFORE AND AFTER STUDYING THAI LANGUAGE ON FIGURATIVE LANGUAGE USING THE COOPERATIVE LEARNING PROCESS (GROUP INVESTIGATION: G.I.) COMBINED WITH CONCEPT MAPS FOR MATTHAYOMSUKSA 3 STUDENTS AT THUNGFON WITTAYAKARN SCHOOL, UDON THANI PROVINCE”. Journal of Humanities, Social Sciences, and Arts 8, no. 1 (March 25, 2026): 140–152. accessed October 1, 2026. https://so03.tci-thaijo.org/index.php/hsa/article/view/290506.