Forum:Unofficial guide books

Recently, an article was deleted about a Spanish book called "La Guia Secreta de Harry Potter", or "The Secret Guide to Harry Potter". If you look on Google or Amazon.com, you can find dozens of such books, including the Lexicon book and one by Mugglenet. Would any of these merit an out-of-universe article, or perhaps a single, general article covering the subject? Even if not, there should be a policy in place about this in case more such articles pop up. - Nick O'Demus 19:28, October 8, 2009 (UTC)