Dyfyniad APA

Chen, L. H., Freedman, D. O., & Visser, L. G. (2020). COVID-19 Immunity Passport to Ease Travel Restrictions? J Travel Med.

Dyfyniad Arddull Chicago

Chen, Lin H., David O. Freedman, and Leo G. Visser. "COVID-19 Immunity Passport to Ease Travel Restrictions?" J Travel Med 2020.

Dyfyniad MLA

Chen, Lin H., David O. Freedman, and Leo G. Visser. "COVID-19 Immunity Passport to Ease Travel Restrictions?" J Travel Med 2020.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.