There are several ways to create a bibliography.
Option 1:
Select the references or collections you want to include. To select multiple items hold the control key. Right-click one of the selected items and choose Create Bibliography.
Choose the bibliographic style you want, and select the output format: Save as RTFor HTML, copy to clipboard or print. (The RTF file format is compatible with all word processors.)

Option 2:
Drag and drop references from Zotero into your document! They'll turn into fully formatted citations. This works with any word processor, including Google Docs. Change the default style on the "gear" menu under 'Preferences.'

Option 3:
If you used Zotero's cite-as-you-write feature in Word, from the Zotero menu in Word click the second icon in the upper left (Create bibliography). (For further explanation see below.)