There are many online tools out there to help you with referencing: from simple reference generators to more complex reference management tools. See below for some examples.

You can also get help at one of our study skills workshops that run throughout the terms. For more information, please see our workshops calendar: http://libcal.gre.ac.uk/workshop 

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Learning to reference correctly is a vital skill for anyone in academia. Cite them right online will help students to reference almost any source, and to understand why this is important.