In your database of choice, use the small bookmark button in the browser address bar to add the search results (or a specific book or article) into your Zotero library. Note that the icon may look different depending upon whether you are viewing a page for a single record, or a list of results, or a web page.
After you have collected your citations in Zotero, select the ones you want to use. Right-click in order to
"Create Bibliography from Selected Items."
Select how you want to export the citations (APA, MLA, Chicago, or some other style; whether you need individual citations or a bibliography; etc.).
If you selected "Copy to Clipboard," open a Word document and paste in your bibliography.