Panya, A., B. Benjathikul, K. Kalyanamitha, J. Suankaew, and Y. Leelakijpaisal. “The Preparation Before the Retirement of Bangkok Metropolitan Administration Staffs”. Asian Interdisciplinary and Sustainability Review, vol. 11, no. 1, July 2022, pp. 61-65, https://so05.tci-thaijo.org/index.php/PSAKUIJIR/article/view/259218.