Nakkan, Phummarin, Pongthep Jiraro, and Panatda Jopao. 2019. “THE DEVELOPMENT OF STANDARDS, INDICATERS AND CRITERIA FOR PROJECT-BASED LEARNING MANAGEMENT OF ELEMENTARY SCHOOL TEACHERS”. Academic Journal of Thailand National Sports University 11 (3). Chonburi, Thailand:255-67. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/244591.