ตั้งสมชัย ชัยวุฒิ. “Sentiment Index of SMEs in Leading Industries in Chiang Mai Province”. Executive Journal 33, no. 2 (April 1, 2013): 72–79. accessed March 6, 2026. https://so01.tci-thaijo.org/index.php/executivejournal/article/view/80773.