Thepwarin, T. “THE DEVELOPMENT OF A LEARNING ACTIVITY SERIES ON THE STORY OF A YOUNG ECONOMIST SOCIAL STUDIES, RELIGION AND CULTURE OF GRADE 5 STUDENTS”. Journal of MCU Nakhondhat, vol. 8, no. 10, Oct. 2021, pp. 262-70, https://so03.tci-thaijo.org/index.php/JMND/article/view/256348.