I have been looking at different software to help me manage all of my bibliographic references and sort them by topic when needed. Most of the programs out there are kinda pricey. Then I found Zotero. Zotero is connected with Mozilla Firefox web browser does this service for absolutely free! It is a pretty cool program that will automatically pull down bibliographic information from a website, coded PDF file or most published books. It does not seem to be able to do all that some of those expensive programs can do. But it is free! If you are connected to the academic world, check it out.