Karnkha, O., and P. haithani. “The Effects of Positive Self-talk Training Program on Emotional Intelligence of the First Year Students of Nakhon Ratchasima Rajabhat University”. Ratchaphruek Journal, vol. 12, no. 2, Aug. 2014, pp. 61-69, https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/240625.