ประดิษฐธรรม ไ. . (2020) “ INDUSTRIAL PRODUCTION IN UPPER CENTRAL PROVINCES GROUP 1”., Journal of MCU Social Science Review. Ayutthaya, Thailand, 6(2-01), pp. 57–64. available at: https://so03.tci-thaijo.org/index.php/jssr/article/view/240070 (accessed: 24 April 2025).