Dave Warlick has a great little tool you might find useful in your own writing as well as with research projects with your students. The Citation Machine will work in either APA or MLA format. Want the citations to look right? He seems to have it down pat.
WARNING: This little tool gets very slow around the end of semesters when college kids begin final drafts of their papers. I guess that shows you how popular a tool it really is, huh.
Try it out.