LAMSARI PURBA, Leony Sanga; HAREFA, Nelius. Pengaruh Kandungan Oksigen Udara Sekolah Terhadap Konsentrasi Belajar Siswa. EduMatSains : Jurnal Pendidikan, Matematika dan Sains, [S. l.], v. 4, n. 2, p. 169–182, 2020. DOI: 10.33541/edumatsains.v4i2.1381. Disponível em: http://ejournal.uki.ac.id/index.php/edumatsains/article/view/1381. Acesso em: 3 apr. 2025.