(2021). WHO considers Pfizer BioNTech COVID-19 vaccine safe in elderly. Reactions Weekly.
Dyfyniad Arddull Chicago"WHO Considers Pfizer BioNTech COVID-19 Vaccine Safe in Elderly." Reactions Weekly 2021.
Dyfyniad MLA"WHO Considers Pfizer BioNTech COVID-19 Vaccine Safe in Elderly." Reactions Weekly 2021.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.