SIANTAR, Riomas Meliana Lumban; SIAGIAN, Liber. INTERNALISASI PROGRAM JUMAT BERSIH DALAM PEMBINAAN KARAKTER PEDULI LINGKUNGAN DI SMA NEGERI 12 MEDAN . SOCIAL : Jurnal Inovasi Pendidikan IPS, [S. l.], v. 5, n. 4, p. 1523–1533, 2025. DOI: 10.51878/social.v5i4.7404. Disponível em: https://www.jurnalp4i.com/index.php/social/article/view/7404. Acesso em: 26 apr. 2026.