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To use Zotero properly, you need to install the Zotero Connector for Chrome, Firefox, or Safari, in addition to the Zotero desktop app. See Downloads.
The Zotero Connector's save button is the most convenient and reliable way to add items with high-quality bibliographic metadata to your Zotero library. As you browse the web, the Zotero Connector will automatically find bibliographic information on webpages you visit and allow you to add it to Zotero with a single click.
For example, if you're on the main page for a journal article, the save button will change to the icon of a journal article (circled in red):
On a library catalog entry for a book, the save button will show a book icon:
Clicking the save button will create an item in Zotero with the information it has identified.
On many sites, Zotero will also save any PDF accessible from the page or an open-access PDF that can be found for the saved item.
Import with Zotero Connector:
Navigate to a website, report database folder or Multisearch results
Click the Zotero Connector Icon
Tick the resources you want to import
Select the collection it will be Saving to
NOTE: Downloading a PDF from a website ALWAYS check the reference is complete in Zotero!