P. A. . . sampannamedhi (kongmag) and P. . Sukumal, “THE MANAGEMENT OF COOPERATIVE LEARNING ACTIVITIES TO PROMOTE VOLUNTEERISM OF UPPER SECONDARY SCHOOL STUDENTS IN MUNICIPAL SCHOOL 1 (BAN PHO KLANG) UBON RATCHATHANI PROVINCE”, JBER, vol. 6, no. 1, pp. 190–202, Jun. 2020.