EasyBib

EasyBib is an automatic bibliography composer. When you have sources you need to cite properly for your research paper, EasyBib will help you format your sources quickly and accurately. Millions of students a month use EasyBib to cite sources for their papers.
EasyBib is a service of ImagineEasy Solutions, a tiny company that makes big products.

However, one user wrote the following warning about using EasyBib.  "If you use the "Website" option and enter a URL, EasyBib will never give a correct entry for an article in an online newspaper or magazine, and it will only give a correct entry for another webpage if whoever published the website coded it correctly, using the work's actual title as the HTML title (and that doesn't even get into other details, like the publication date). In short, though I know it's tempting to do the easy thing and just plug in the web address, it's just not gonna work, and you're better off just doing it by hand."

Great app, but be careful when recommending its' use to your students.