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Zotero
Zotero is a free Firefox extension to help users collect, manage, and cite their research sources. This research tool helps users gather, organise, and analyze sources (citations, full texts, web pages, images, and other objects), and lets them share the results of their research in a variety of ways. Zotero is a production of the Center for History and New Media at George Mason University. It is funded by the United States Institute of Museum and Library Services, the Andrew W. Mellon Foundation, and the Alfred P. Sloan Foundation.