This document discusses various reference management tools for keeping track of sources and citations. It compares Endnote, Endnote Web, Zotero, and Mendeley, which allow users to create bibliographies, attach files and PDFs, link to full-text sources, and cite sources while writing. The document notes that Endnote has both desktop and web versions while the others are primarily web-based. It provides links to learn more about each tool and contact information for the librarian author.