If you are citing a published work that you have written, cite it as you would that type of work (e.g. book, journal article, photograph), entering yourself as the author.
Unpublished work can be treated as the type of work such as a web page or photograph with no publishing information or can be treated as Nonrecoverable sources.
Assignments submitted for another subject can be treated as unpublished manuscripts.
Format
Author. (Year). Title of the assignment [Unpublished assignment for unit ...]. University of Canberra.
Example
Edwards, J. (2024). Genetic variations in indigenous populations [Unpublished assignment for unit 99002]. University of Canberra.