พระนาค ส. (2021) “A Study of Problems of Internal Quality Assurance Operations under the office of the Non-Formal and Informal Education Uthaithani Province”, Education journal Faculty of Education, Nakhon Sawan Rajabhat University . Nakhon Sawan,Thailand, 4(3), pp. 13–22. Available at: https://so02.tci-thaijo.org/index.php/edunsrujo/article/view/250227 (Accessed: 6 May 2024).