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.
Fun little book. Children write and draw pictures about cats. A smaller section is devoted to other pets while another part is about cruelity and captivity. Great little book to use for children's story hour where children can write, draw pictures and talk about how cats affect them and their homes. Hearing how other children felt they would enjoy sharing their own stories.