Hutagaol RP, Niken N. VALIDASI METODE PENETAPAN KADAR CYANOCOBALAMIN SECARA SPEKTROFOTOMETRI VISIBEL DOUBLE BEAM. J. Sains Nat. [Internet]. 2017 Nov. 25 [cited 2026 Apr. 30];2(1):24-3. Available from: https://ejournalunb.ac.id/JSN/article/view/32