Dyfyniad APA

(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.