The purpose of referencing is to enable others to find the information that you have used in your assignment.
You MUST cite and reference all the information that you have used in the main text of your assignment. It is important to acknowledge the work of others if you have referred to it in your assignments; if you do not, you will be accused of plagiarism.
Plagiarism is a failure to acknowledge another person's work or idea and claiming this idea as your own. This is a serious offence.