Siregar, Eka Darmayanti Putri, Arni Amir, and Nuzulia Irawati. 2022. “The Consumption of Protein, Zinc, and Vitamin a Associated With Ferritin Levels in Pregnancy”. Jurnal Gizi Dan Dietetik Indonesia (Indonesian Journal of Nutrition and Dietetics) 10 (3):100-108. https://doi.org/10.21927/ijnd.2022.10(3).100-108.