I came across a post by the MS Word team about the Bibliography and Citations Feature in Word 2007 while researching something entirely different. I read the post though with some interest as doing these were always a pain for me in school as so much of my time was spent trying to figure out the format for the particular style and type of reference. (I wasn't an English major and I doubt they can even remember from paper to paper). I haven't had to do this myself in a while (still waiting to submit my latest paper to the consortium...) but I did have to help my fiance with her last college English class. I wish I had known how easy Word 2007 makes it.
1. On the ribbon, select the references tab and then choose the style you are required to use.
2. Click Manage Sources
3. Click "New" in the center of the Source Manager dialog.
4. Choose the type of source.
5. Complete the fields the dialog presents depending upon your type of source.
Notice how it gives you examples at the bottom when you put your cursor in each field.
6. Click Ok.
7. Close the Source Manager Dialog.
8. Back on the References tab, click Bibliography and then select Bibliography or Works Cited as required.
9. Word will insert your choose into the document.
Pretty neat!
You can also get information about the different styles by searching for the particular style on Google or do like I did before the Internet and use The Little, Brown Essential Handbook for Writers.