Zahra Elfa Yuda, S., Laksmana Cs, A., Afrida, A., Hapsari, N.T., Sagougouk, O. and Suryani, M. 2025. STRENGTHENING EDUCATIONAL FOUNDATIONS AND PRINCIPLES FOR 21ST-CENTURY MATHEMATICS TEACHER PROFESSIONALISM DEVELOPMENT. Algebra : Jurnal Pendidikan, Sosial dan Sains. 5, 1 (Aug. 2025), 135–142. DOI:https://doi.org/10.58432/algebra.v5i1.1423.