Chaipakdee, Banjamas, Supakorn Sornphet, and Chanwit Hanrin. 2022. “Conditions, Needs and Guidelines for Self and Professional Development of Teachers in Schools Under the Nakhon Phanom Primary Educational Service Area Office 1”. Journal of Education Rajabhat Maha Sarakham University 19 (2). Bangkok, Thailand:130-43. https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/258620.