When writing a piece of work you should provide references to the sources used. A reference is the detailed bibliographic description of the item you used to gain information e.g. author, title, date and place of publication, publisher. References are briefly cited within the text, and then given in full at the end of your work in a Reference List.
See more information about referencing and how to reference using the DMU Harvard referencing system, IEEE referencing system and OSCALA (law).