Referencing acknowledges the sources of information you've used in your work. There are two parts to referencing:
Why do I have to reference?
In short, referencing shows that you are neither making up facts nor presenting other people's ideas as your own. Good referencing will:
How do I reference?
The main style of referencing you'll use is American Psychological Association (APA) 6th Edition, but check with your teacher as to their preferred style.
How you write and format your references varies depending on:
By presenting your references in a predictable and consistent style you make it easier for your reader (ie. the marker) to follow your work. You risk losing marks on your assessment if your referencing is not up to standard.
These three sites help to build your own references list