SITANGGANG, HD. Melva; LUMBANRAJA, Edward A. Student Cognitive Correlation of Concern for the Surrounding Natural Environment . Jurnal Penelitian Pendidikan IPA, [S. l.], v. 9, n. 8, p. 6742–6767, 2023. DOI: 10.29303/jppipa.v9i8.4977. Disponível em: https://jppipa.unram.ac.id/index.php/jppipa/article/view/4977. Acesso em: 28 jul. 2024.