Need internet sources to justify the fear of death (thanatophobia)?

I have to write a speech in a public speaking class about my biggest fear. My biggest fear is dying, but for some reason my teacher is making us find 3 good sources on the internet to justify that. I can't find a single thing on the internet that finds thanatophobia rational, they all say that it's irrational (in other words: The internet only says things about not fearing death, I need things on why people should fear death)

Most anything will do as long as it has its own article or something similar. A post on a forum doesn't quite count unless it provides good evidence. Thanks for your time