To extract the references, Scholarcy usually needs access to the full text of the article or chapter, unless the publisher has made the references openly available with the abstract. Otherwise, the article/chapter needs to be open access, or you need to upload the PDF directly, if you have legitimate access to it.
Reference extraction is available within the Chrome Extension, if you are logged into your Scholarcy account, or within Scholarcy Library. Within the summary flashcard for the article, click the Download button in the References tab to download them as either a RIS or BibTeX.
In Scholarcy Library, you can also export the references in bulk from a collection of articles.