Harvard Health: Health Information and Medical Information :
https://www.health.harvard.edu/diseases-and-conditions/tinnitus
https://www.health.harvard.edu
National Institutes of Health (NIH)
https://www.nidcd.nih.gov/health/tinnitus
Webmd:
https://www.webmd.com/a-to-z-guides/understanding-tinnitus-basics
NHS inform
https://www.nhsinform.scot/illnesses-and-conditions/ears-nose-and-throat/tinnitus
Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tinnitus/symptoms-causes/syc-20350156
ATA- American Tinnitus Association
Wikipedia
https://en.wikipedia.org/wiki/Tinnitus
ATA – What is Tinnitus?(you tube)
NIH- Journey of sound to the brain