These tools save and organize references, and can integrate with word processors to format in-text references and bibliographies. See here for comparisons between the programs mentioned below and some others.
Free and open source, so no concerns about whether your access will be interrupted after you leave Duke. Support for collaboration is a particular strength and the browser extension for importing references is very robust. Training and support at https://www.zotero.org/support/
(NOTE: NetID authentication required for this link) Proprietary and licensed for all current Duke affiliates (so you get it without paying), but alums would need to pay or transfer to another tool. Handling of collaboration/coauthorship is not as nice as in Zotero and Mendeley and the browser extension is horrible, but users love features like Find Full Text (pdf fetching) and easy customization of output styles. Training and support at https://clarivate.libguides.com/endnote_training/users
Free but proprietary (so possible concerns with vendor lock-in and lack of transparency). Nice collaboration features and social sharing/discovery. Users like the pdf annotation features, too. Training and support at https://www.mendeley.com/guides