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KnightCite is an online citation generator service provided by the Hekman Library of Calvin College. It provides a form to enter citation data from a large variety of sources that will return citations formatted in MLA (7th edition), APA (6th edition), and Chicago (16th edition) styles.
Google Docs add-on that allows you to insert citations from all over the web including PubMed, Google Scholar, and more. Add references to journal articles, book chapters, websites - any resource you are citing.