Jaikong, Chalermchai, and Thosporn Sangsawang. 2021. “Instructional Package on Health and Physical Education in Taking Care of Hygiene of Various Body Organs for Primary School Teachers”. Mahachula Academic Journal 8 (3). Bangkok, Thailand:153-66. https://so04.tci-thaijo.org/index.php/JMA/article/view/247728.