No real evidence of these activities has been offered by any credible source.

The teachers also do not allow students to use Wikipedia as a credible source of information at all.

"There has not been a specific allegation from a credible source."

Couldn't you have linked to a source more credible than dailybail.com, Hadley?

"Unfortunately, he's not what I'd call a credible source of information."

It would be nice to have a credible source for the opposing side.

"Teachers said students have to learn what a credible source is," she said.

There's a reason why he can't find credible sources.

You were suddenly aware that stories from credible sources - in this case your parents - could be completely made up.

"I've heard from very credible sources that the people of Alaska are going to be surprised at how little federal money is coming in."