Referencing is made up of two key parts:
Citations
Whenever you use information that you have read in another source you must create a citation to the source in the body of your text as well as the full reference at the end of your work. This citation refers the reader to the full reference in the reference list or bibliography. Citations should be used whenever you use someone else's ideas, whether you put them into your own words (paraphrasing), summarise them, or quote directly.
Reference list
The reference list is usually in the form of an organised list with full details of the works you have used. It should appear at the end of your work and contain further information of the sources used. The references should all follow a set 'style' and be written accurately and consistently. The reference list allows the reader to find the original sources of information that you have used and read them for themselves.
What is the difference between a Reference List and a Bibliography?