Citation managers, also known as bibliographic managers or reference management software, are used to gather, collate and organise your references and/or citations. These are softwares and applications that are available online, some are free, while others are fee based.
Most are comprised of an application, with an add-on for your web browser to capture references online, and an add-on for your word processing application to ensure the correct format of citation insertion, and bibliography generation.
Many of these managers can automatically format to a specified citation style (Harvard, Chicago etc.), and generate bibliographies from the citations inserted via the application into your assignment.
These can save you time at the end of your assignment, but only if you capture and manage your citations/references as you work through your assignment.
Don't forget to leave time at the end of your assignment for checking your citations and generating your bibliography.
A full list of citation managers and a comparison of their features is available from wikipedia
Recommended managers:
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