Yodchalood, Bussarakham, Warawat Sriyabhaya, Jaruwan Benjatikul, and Boonyong Ketthet. 2021. “A Comparative Study of Consonants and Vowels in Words of Tai Ya’s Chiang Rai and Bangkok Thai”. Dhammathas Academic Journal 21 (4):287-300. https://so06.tci-thaijo.org/index.php/dhammathas/article/view/249347.