See this example properly formatted in the QUT Cite tool.
You must not re-use your own work without proper acknowledgement.
You should not use material from previous assignments unless you have permission from your unit coordinator. Some assessments are split into two parts and you need to reuse or refer to the first part in the second. If you think this is the case, check your assignment information. If you are still not sure ask the Unit Coordinator.
If you need to refer to a previous assignment of yours, treat it like a Personal Communication but give it the title of the assignment - see:
If the work has been published you can use it, but you should reference it as you would any other published work. To find out more - go to Study Smart Module 4.3.1: Academic integrity and misconduct.