HUTAGAOL, Ricson P.; NIKEN, Niken. VALIDASI METODE PENETAPAN KADAR CYANOCOBALAMIN SECARA SPEKTROFOTOMETRI VISIBEL DOUBLE BEAM. Sains Natural: Journal of Biology and Chemistry, [S. l.], v. 2, n. 1, p. 24–34, 2017. DOI: 10.31938/jsn.v2i1.32. Disponível em: https://mail.ejournalunb.ac.id/JSN/article/view/32. Acesso em: 30 apr. 2026.