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You need to reference all information sources you use. To do this, you just need to insert a citation in your text and then expand on this in a footnote or full reference list at the end of your work. The exact way you need to do this depends on your referencing style.
Finding your referencing style
Each department of the University uses a particular referencing style. Use the menu below to find out which referencing style your department uses. You'll find each department listed alphabetically, with the referencing style given in brackets.
Once you've found your department and style, click the link to be taken to guidance for your style!
There are several places you can find help with understanding referencing.