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