We should link back from our article to the Project Gutenberg page of the author; after all, there is at least one public domain text of this author available! Please make sure an author is linked back to PG before removing the entry from the list!
Use {{Gutenberg|no=NUMBER|name=BOOKNAME}} for a single work.
Use {{gutenberg author | id=First_Last | name=First Last}} for a link to all the works in PG of that author.