When you are writing something longer with a lot of citations, the more likely it is that you will want to use some kind of software to help manage your research. These programs, called citation managers or reference managers, are especially helpful to automate inserting citations and bibliographies into your papers, proposals, theses, dissertations, book chapters, etc.. There are dozens of these programs (see Comparison of reference management software). Librarians are available to help you with Zotero and Mendeley questions.
Zotero is a free, easy-to-use tool to help you collect, organize, annotate, cite, and share research. It is available for Mac, Windows, Linux, and iOS. View a "getting started with Zotero" slideshow by one of the UM-Dearborn librarians. A lot more help is available on the Zotero website.
Mendeley is a free reference manager that can help you store, organize, note, share and cite references and research data. It is available for Windows, Linux, macOS (but not macOS 11 Big Sur). Many Help guides are available.
EndNote Web is part of the Web of Science database. This is a simplified, online only version of EndNote. Help is available through a guide created by the Taubman Health Sciences Library.
Note: The full version of EndNote is available for purchase on OnTheHub, U-M's student/faculty software site.