MARPAUNG, Bernardo. KINERJA GURU PROFESIONAL di SMA NEGERI se-KABUPATEN SERDANG BEDAGAI. Tunas Geografi, [S. l.], v. 1, n. 1, p. 170–185, 2013. DOI: 10.24114/tgeo.v1i1.496. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/tgeo/article/view/496. Acesso em: 15 aug. 2025.