Zotero comes with the most common bibliographic styles, but many more are available to download.
To install a style:
The new style will appear in Zotero's style lists.
To create a bibliography from your Zotero library select the relevant references or collections. To select multiple sources hold the control key and click the items. Right-click one of the selected items and choose Create Bibliography.
Choose the bibliographic style you want, select Copy to Clipboard, click OK, and paste the Clipboard text into your word processor.
This method works with any word processor (or anywhere you can paste text).
Zotero offers word processing plugins for Word and OpenOffice. The plugin adds to your word processor a Zotero toolbar that allows you to add citations to your document while you write.
To add a citation click the first toolbar button ("Add/Edit Citation"). Search for and select the reference/s and press Enter. Zotero will add the citation at your cursor.
At the end of your paper, click the "Insert Bibliography" button. Your bibliography will appear, and new citations will be added automatically. Change bibliographic styles with the "Document Preferences" button.
The toolbar looks different on different operating systems and different versions of Word. Mouse over the toolbar to see a description of each button's function.