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Zotero is a reference manager designed to store, manage, and cite bibliographic references, such as books and articles. It also is a powerful tool for collecting, organizing, and sharing research information and sources.
This free, open source tool works with Macs and PCs (a beta version for Chromebooks has recently been released). Download both desktop and browser extension for it to work with Google Docs and MS Word. References also can be copied and pasted.