Reference managers are applications that help you manage references and generate citations and bibliographies. If you have never used one before, Zotero is a good choice, it has lots of features and good help information available.
More Help from Zotero
Learn about getting started with Zotero, the free reference manager used for tracking your citations as you search, saving and organizing, and generating list of references in your preferred citation style. Robbins workshop slides linked below: