Theslek, Aphichet, and EAKASIT PHOSAI. 2026. “Development of Learning Achievement on Parts of Speech through an Innovation Kit Integrated with the Yoniso-manasikara Principle for Grade 6 Students: Development of Learning Achievement on Parts of Speech through an Innovation Kit Integrated with the Yoniso-manasikara Principle for Grade 6 Students”. Mahachula Academic Journal 13 (2). Bangkok, Thailand:107-21. https://so04.tci-thaijo.org/index.php/JMA/article/view/289408.