A small list of citation styles is pre-populated in Document Preferences within your Zotero account.
Steps to add a new style:
- Open Zotero
- Click on Edit > Preferences > Select the "Cite Tab" > Click on "Get additional styles
- Hover your cursor on the style name to see examples of the style

- Click style you want to add. Click OK.

- Style should now be added to your Zotero Document Preferences.
