Some departments use different referencing schemes:
Students on the MA English course use the Modern Humanities Research Association (MHRA) style. Details of the MHRA scheme are available here, http://www.mhra.org.uk/Publications/Books/StyleGuide/StyleGuideV3_2.pdf
Psychology uses the APA system. APA referencing guidelines - PDF 574.0 KB
Always consult your unit handbook or tutor to make sure you are using the correct system for the unit.