Reliable Websites

What makes websites reliable, where do they get their information from, reliable sources?
Websites like WIKIPEDIA are written by the public, therefore the information is not guaranteed to be true. There are links at the bottom of the page showing the source of their information which makes it more reliable.
Blogging websites are written by the public, with no proof given for their information making them unreliable.
Reliable websites are generally news website where their information is proven, websites like the BBC.


Who? (who writes the information)
What? (what are they saying)
Why? (for what reason are they saying this)
Where? (This information can be found on websites like forums and blogs)