American Heart Association. https://www.heart.org/en/news/2020/03/25/covid-19-science-understanding-the-basics-of-herd-immunity
Diakses pada 27 Maret 2020Science Media Centre. https://www.sciencemediacentre.org/expert-comments-about-herd-immunity/
Diakses pada 27 Maret 2020Hopkins Medicine. https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/coronavirus-social-distancing-and-self-quarantine
Diakses pada 27 Maret 2020SehatQ. https://www.sehatq.com/artikel/physical-distancing-bukti-pentingnya-kesehatan-mental-pada-masa-pandemi-virus-corona
Diakses 4 Mei 2020