APA引文

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

Citação norma Chicago

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

MLA引文

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

警告：這些引文格式不一定是100％准確.