If you don't see the Zotero toolbar in Microsoft Word, do the following:
Zotero offers word processing plugins for Word and OpenOffice. The plugin adds a Zotero toolbar to your word processor that allows you to add citations to your document while you write.
To add a citation:
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 versions of Word. Mousing over the toolbar will pop up each button's function if they're not clearly labeled.
Zotero works with Google Docs! You must have the Zotero Connector installed in Chrome, Firefox or Safari.
Instead of a toolbar with buttons, as in the Word screenshot above, look for the Zotero menu in your Google Docs editor.
Zotero comes with the most common bibliographic styles. Download other styles from the Zotero website.
To install a style:
The new style will appear in Zotero's style lists.