การถัก อนุวัฒน์. “The Formation of Sakon Nakhon Urban Planning in Early Rattanakosin Period”. Journal of Humanities and Social Sciences, Rajapruk University 4, no. 3 (January 27, 2019): 1–13. Accessed April 25, 2024. https://so03.tci-thaijo.org/index.php/rpu/article/view/168274.