It’s simple really. Go down to the library. There you’ll find shelves full of books on various subjects that should be suitable for whatever you’re researching. Indeed, they are probably more useful to you and accurate than some of the articles on wikipedia or the internet in general.
Don’t get me wrong, I understand the reasons why wikipedia are staging their blackout and I do respect them for making a stand, just as I support any other site that is doing this. However, anyone who thinks that the site is 100% a reliable and credible resource to use for their homework is a bit of a fool really.