Piananurak, S. and Theekaprasertkul, P. (2024) “TREATISE IN THE REIGN OF KING RAMA 3 : CONTENTS AND CONCEPTS”, Phranakhon Rajabhat Research Journal : Humanities and Social Sciences, 19(1), pp. 150–165. available at: https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/269137 (accessed: 14 September 2026).