Ruangkalapawongse, A.; Ruangkalapawongse, S.; Chuanchom, J. .; Chantarangsee, J. .; Popichit, N. .; Sirikudta, S. .; Serirat, S. .; Archarungroj, P. . 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. soc sci hum utcc 2022, 42, 125-145.