Sari, Dewi Kartika, and Halimatus Saidah. “Effectiveness of Vitamin C and Vitamin B12 on Hemoglobin Levels in Pregnant Women in the Third Trimester”. Journal for Quality in Public Health, vol. 5, no. 1, Nov. 2021, pp. 272-9, doi:10.30994/jqph.v5i1.256.