SomsathanFirst, P. . “Finding the Efficiency of the Results on Using the Royal Vocabulary for the King, the Body-Category Vocabulary of Thai Language for Grade 4th Thai Students, at Unity Concord International School, Chiang Mai Province”. PAYAP UNIVERSITY JOURNAL, vol. 31, no. 1, June 2021, pp. 1-14, doi:10.14456/pyuj.2021.1.