Can I add cookbooks that do not have ISBN numbers? We are not yet able to add books without ISBNs but we do plan to add that feature in the future. We also plan to allow members to add magazines. Related articles Can I get a book added to the EYB Library? I keep my cookbooks in two different locations - do I need two Bookshelves? Adding books to your Bookshelf Bookmarking a book Is there a limit to the number of cookbooks I can have on my Bookshelf?