พันธวงษ์ ป. and บุญชู ส. (2018) “Peace Flowers, Peace Happiness in Suratthani Province”, MCU Haripunchai Review, 2(1), pp. 22–35. available at: https://so04.tci-thaijo.org/index.php/JMHR/article/view/174136 (accessed: 29 September 2026).