Sari SN, Kamila R, Pakpahan SR, Siregar FW. IMPLEMENTATION OF PROFESSIONALISM BY MATHEMATICS TEACHERS IN MANAGING LEARNING AT UPT SMP NEGERI 35 MEDAN. Algebra JPSS [Internet]. 2025 Aug. 24 [cited 2026 Sep. 17];5(1):41-5. Available from: https://ejournal.yana.or.id/index.php/algebra/article/view/1326