Situmorang, Chazali H, and Wahyu Triono. “Public Perception of Increasing Immunity to Facing Covid-19 By Buying Vitamins at Pharmacies”. International Journal of Social and Public Administration 2, no. 1 (September 9, 2022). Accessed November 23, 2024. https://journal.unas.ac.id/ijsa/article/view/1866.