Raminto, R., Khairudin, K. and Rahayu, N.P.W. 2024. THE ROLE OF PRINCIPAL SUPERVISION, EDUCATION AND TRAINING, AND THE IMPROVEMENT OF TEACHER PROFESSIONALISM AT UPTD SMP NEGERI 2 SEKAMPUNG UDIK, EAST LAMPUNG REGENCY. Journal of Management, Business and Social Sciences. 2, 2 (May 2024), 27–34.