CMS Add article source field?
 

I have numerous press releases sent to me from various publications and organizations that I would like to post in the news section as the admin, but I want to attribute them to another source as author. Is there a way to add an additional field for the source under the Publishing Options in the article editor? My previous article management software allowed you to do this and it worked well for this purpose, as I also added fields for their contact information as well.