Atika Fadhilah Danaz Nasution, and Imelda Imelda. 2022. “Differences in Immunoglobin a Levels in Breast Milk Between Mothers With and Without the Covid 19 Vaccine”. Majalah Kesehatan Indonesia 3 (2). Lampung, Indonesia:71–76. https://doi.org/10.47679/makein.2022103.