Unknown - Books can be attributed to Unknown when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using Unknown.Books whose authorship is purposefully withheld should be attributed instead to Anonymous. Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".Books whose authorship is purposefully withheld should be attributed instead to Anonymous.
