Credible Person?? Which one do you want?
Joe Akhiminar?
Alfred Mosiad?
John Jisztneck?
Roberto Almistin?
Point I'm trying to make is that you can make up anybody you want... and lable him as credible

you think you won't get away w/ this? Hehe, you'd be surprised as to how many people DO get away w/ it. I'm assuming that this is a debate for school? Because if it's completely professional then don't expect to get away with it... in my years.. I have quoted the TIMES wrongly to help my SAT 2 Essay prompt... risky - but I took the shot, just made up some ambiguous answer like, "IN the Febuarary 1994 Issue of Time magazine" etc, etc... it works, most people will take your word for it
I've done this during my HS MUN conferences, and I got gavel and gavel (top honors

) it's all in the delivery, and if you can sound convincing enough, most people will be in such awe that they will look for the wrong thing and would never suspect that everybody that you cited is a fictional character!!
Although, credibility is a funny source nowadays... there are many people who are credible in different ways. And there are times when one person maybe credible to you and not to me. We all have our own line of thoughts, and we use that to make our judgements towards other people. If we run into somebody who appeals to us, then the chances of him/her becoming more credible would increase..... however, if the vice versa occurs, then we'd never view the person as logically credibly... we'd block the thought from our minds.
BWAHAHAHAHAH - (GG runs off cackling) -> (but slips and falls on ASS!) -> "AAARRCK my ass!"
)(GG)