credit line

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A line of copy acknowledging the source or origin of a news dispatch, published article, or other work.
• noun The maximum amount of credit to be extended to a customer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun publishing A line of printed text attached to written material, an image, illustration, or the like, which identifies the author, photographer, or other source.
• noun finance A line of credit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a line giving the name of the writer of a story or article
• noun the maximum credit that a customer is allowed