Johns Hopkins Medicine. https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/coronavirus-face-masks-what-you-need-to-know
Diakses pada 11 Juni 2020Web Md. https://www.webmd.com/lung/news/20200430/face-shields-a-more-effective-deterrent-to-covid#1
Diakses pada 11 Juni 2020Self. https://www.self.com/story/face-shields-coronavirus
Diakses pada 11 Juni 2020