Imiwat, P., P. Bannalert, N. Rakngam, P. Kaewsri, T. Pongta, C. Panyalong, and N. Jitruksa. “ Chiang Rai Province”. Governance Journal, vol. 7, no. 2, Dec. 2018, pp. 173-9, https://so01.tci-thaijo.org/index.php/gjournal-ksu/article/view/163557.