File:Harry Potter and the Prisoner of Azkaban.jpg

Fair use for Harry Potter
This image, Harry Potter and the Prisoner of Azkaban.jpg, is being linked here; though the picture is subject to copyright I (TonyJoe) feel it is covered by the U.S. fair use laws because the use of a single cover "to illustrate an article discussing the book in question" is allowed. Absent of an official "series cover," it logically follows that this single cover used in conjunction with its fellows to illustrate an article on the series to which they all belong is allowable.