RefME is a free online citation / bibliography maker. It features many of the ways to cite references that you would expect – including URL, ISBN, ISSN, or search by article title. What got my attention was the ability to reference books by simply scanning their barcodes using their iOS and Android apps. RefME supports 6,500 referencing styles including MLA and APA.
In addition to creating in-text citations, you can add quotations and annotations to any citation.
They offer a number of exporting options including Word, Evernote, and copying to your clipboard.