SPAIS uses Harvard style referencing as laid out in Cite them Right - see below. The Library Referencing webpage provides a general guide to referencing.
Provides guidance on how to cite and reference almost any type of source. Also includes an introduction to referencing for anyone who is unsure or needs a refresher of the principles.
Reference management software can make collecting, storing and using references easier. EndNote reference management software is available for free to University of Bristol students and staff.
You can set up your EndNote account using the link below.
An online bibliographic referencing tool. Use it to collect, store and organise your references and create your reference list as you write. For more information and help see the library's EndNote Online help page.
Cite Them Right by 
Use EndNote reference management software to collect, store and import references into your work.