; . Jurnal Ilmiah Sains, [S. l.], v. 16, n. 2, p. 104–107, 2016. DOI: 10.35799/jis.16.2.2016.15150. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/15150. Acesso em: 20 mei. 2024.