Ophinni, Y., A. S. Hasibuan, A. Widhani, S. Maria, S. Koesnoe, E. Yunihastuti, T. H. Karjadi, I. Rengganis, and S. Djauzi. “COVID-19 Vaccines: Current Status and Implication for Use in Indonesia”. Acta Medica Indonesiana, vol. 52, no. 4, Dec. 2020, p. 388, https://www.actamedindones.org/index.php/ijim/article/view/1648.