There are a
number of systems used for referencing. The Harvard system (covered here in a
comprehensive set of web pages) is used in many of the Humanities
Colleges.
The maths department and some science departments use the Vancouversystem.
TESOL, The School of Psychology and the Business School use APA.
OWL Purdue have a useful video about APA.
These .pdfs can be downloaded to phones and tablets. Useful in class or in the library.: