S. Unjai, J. Dibyamadala, and C. Mangkhang, “STATE OF PROBLEM-BASED LEARNING MANAGEMENT IN SOCIAL STUDIES TO PROMOTE CREATIVE THINKING SKILLS OF PGA K’NYAU STUDENTS BAN NONGBUA SCHOOL TAK PROVINCE”, JSBA, vol. 5, no. 5, pp. 413–425, May 2020.