MPhil and PhD students in SPRI should use the Harvard referencing style. There are more details in Anglia Ruskin University's Harvard referencing guide, Imperial College London's guide to Harvard and Cite them right.
To find out more about the University of Cambridge’s view on plagiarism and good academic practice, as well as further advice on how and when to reference, visit these guidance pages and use the Plagiarism LibGuide.
You'll find a reference management tool useful for managing your citations and creating bibliographies once you've learnt how to use the software. University of Cambridge Information Services provides some support for popular reference management products at Cambridge and this guide can help you to choose and use the most appropriate tool for you.