Yoosung, Sukanda, and Thairath Sittitool. 2020. “Teacher’s Performance Based on to Professional Standards of Teachers Under the Office of Samut Prakan Provincial Primary Education Area 1”. Ratchaphruek Journal 18 (3):129-38. https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/241432.