AMIRZAN. Implementing Discipline in the Covid-19 Period in Improving Student Achievement. Jurnal Serambi Ilmu, [S. l.], v. 22, n. 2, p. 178–185, 2024. DOI: 10.32672/jsi.v22i2.971. Disponível em: https://jurnal.serambimekkah.ac.id/index.php/serambi-ilmu/article/view/971. Acesso em: 2 dec. 2025.