Jongkatkorn , C. “Development Of a Phenomenon-Based Learning Manual for Master’s Degree Students in Social Studies, Mahachulalongkornrajavidyalaya University, Nakhon Sawan Campus”. Journal of Dhamma for Life, vol. 32, no. 3, Apr. 2026, pp. 222-38, https://so08.tci-thaijo.org/index.php/dhammalife/article/view/6330.