Ruangkalapawongse, Annop, Sarawan Ruangkalapawongse, Jirat Chuanchom, Jariyada Chantarangsee, Nongluck Popichit, Supada Sirikudta, Sirivan Serirat, and Paiboon Archarungroj. 2022. “Creating Competency Development Courses for Small-Sized Tourism Personnel and Entrepreneurs through Value-Based Participation Training by Using Sustainable Sufficiency Economy: Case Study of Eastern Province Group Chonburi, Rayong, Chanthaburi, Trat”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences 42 (3):125-45. https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/254142.