This video shows how you can use Zotero and Google (scholar.google.com or books.google.com) to quickly build a bibtex bibliography file.
(Best watched fullscreen)

With the method shown here you can build your bibliography files very, very fast compared to conventional methods. All you need is firefox with the Zotero addon (go to Tools/Add-ons, select Browse all add-ons and enter Zotero in the search mask). Note: in the Zotero preferences you need to set the format to Bibtex for this to work.

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