The Mechanical Engineering department does not have a single preferred style, so you might want to check with your lecturer/supervisor. Some common styles include:
Read more about citing.
See the Thesis Guide for resources for writing your thesis and instructions on depositing it.
If you're wondering how to format it, have a look at what other Mechanical Engineering theses have done before.
Remember that I'm always happy to answer any questions you have about researching, citing, or anything else!