"COVID-19 Voting Advisory". County of San Mateo (California) Assessor, County Clerk, Recorder & Chief Elections Officer. Archived from the original on 1 October 2020. Retrieved 30 September 2020.
uoregon.edu
health.uoregon.edu
"Barrier Devices"(PDF). Patient Education Information from University Health Center’s STI Screening Clinic.
web.archive.org
"COVID-19 Voting Advisory". County of San Mateo (California) Assessor, County Clerk, Recorder & Chief Elections Officer. Archived from the original on 1 October 2020. Retrieved 30 September 2020.