ลักษณะศิริ จุไรรัตน์. “Moral Textbooks by Chaopraya Pra Sadej Surantrathibaudee (M.R. Pia Malakul)”. Journal of the Faculty of Arts, Silpakorn University 38, no. 1 (March 21, 2019): 80–110. Accessed May 20, 2024. https://so04.tci-thaijo.org/index.php/jasu/article/view/181222.