The Zotero plug-in for Google Docs allows you to add citations to your document while you write.
To add a citation:
Finished writing? Add your Works Cited page:
If you need to change the bibliographic styles, choose "Set Document Preferences"
You will get this window where you can choose a different style.
It's easy to create a bibliography from your Zotero library.
Select the references or collections you want to include. Hold the control key and click to select multiple items. Right-click one of the selected items and choose Create Bibliography. Choose the bibliographic style you want, and select the output format: Save as RTF or HTML, copy to clipboard or print. (The RTF file format is compatible with all word processors.)
Or you can just drag and drop references from Zotero into your document! They'll turn into fully formatted citations. This works with any word processor including Google Documents. To insert an in-text citation, hold the shift key before dragging. (To use a different style, change your Quick Copy settings in the Export pane of the Zotero preferences.)
ZoterboBib: Fast and easy citing - Auto and manual options - proofread the auto option carefully!