tantivejkul, sumet. “The Royal Initiative on ‘sustainable development’ Bring Happiness to the People”. King Prajadhipok’s Institute Journal 14, no. 3 (September 1, 2020): 51–64. Accessed April 23, 2024. https://so06.tci-thaijo.org/index.php/kpi_journal/article/view/244194.