Raminto, R., K. Khairudin, and N. P. W. Rahayu. “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, vol. 2, no. 2, May 2024, pp. 27-34, https://journal.ubl.ac.id/index.php/mabuss/article/view/200.