Zotero: The Tri-College Libraries recommend Zotero, a free tool that can format your bibliography, keep your citations organized, and even save your articles in the cloud so you can access them later from the library, home, or a cafe.
EndNote Basic: The Tri-Colleges provide free access to EndNote Basic.
These slides are from a workshop given in McCabe a few semesters ago. Click through the slides to learn about different digital tools that might be helpful, and also to review some pros and cons of each.