APA citiranje

Lopez Bernal, J., Andrews, N., Gower, C., Gallagher, E., Simmons, R., Thelwall, S., . . . Ramsay, M. (2021). Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant. N Engl J Med.

Citação norma Chicago

Lopez Bernal, Jamie, et al. "Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant." N Engl J Med 2021.

MLA citiranje

Lopez Bernal, Jamie, et al. "Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant." N Engl J Med 2021.