Wikimedia Commons has media related to Book covers.

To place a file in this category, add the tag ((Non-free book cover)) to the bottom of the file's description page. If you are not sure which category a file belongs to, consult the file copyright tag page. If this category is very large, please consider placing your file in a new or existing subcategory. Free files can be moved to the Wikimedia Commons.

By default, ((Non-free book cover)) adds images to this category. However, |category= should be used to assign the image to a more specific image category:

((Non-free book cover |category=Stephen King book covers))

Sorting defaults to ((PAGENAME)), but |title= may be used if sorting by the filename is not preferred:

((Non-free book cover |category=Fantasy book cover images |title=Game of Thrones, A ))

As with the other non-free image templates, sorting by words other than the title is possible as well by using:

((Non-free book cover |category=Poetry book cover images |sort key ))

Images in this category are claimed to be non-free book cover images under Wikipedia's non-free content use policy. This category is not for public domain book covers, which should simply be tagged with the relevant public domain template. For information about exploring, searching and finding images on literature and books, see Wikipedia:WikiProject Books/Images.