For detailed information and Harvard Referencing examples check the full length version of DkIT's Guide to Harvard referencing and the Harvard Referencing Libguide.
The Harvard referencing style has two parts:
1. Citation
2. Reference List
Referencing is when you acknowledge that you have used someone else's material or ideas in your own work.
DkIT uses a specific version of the Harvard style of referencing, which is supported by the Library and covered in this guide.
Your lecturer might want you to use a different referencing system, such as footnotes or numbers. Check with them before you start your assignment.