Usually, the Library will have a copy of prescribed textbooks available online. Follow the instructions here to access your Reading List and prescribed textbooks.
If you want to buy a personal copy of your textbook, you can check if the CDU Bookshop has it stocked.
You can also purchase new and secondhand textbooks from:
Make sure you check your unit outline or Reading List that you are purchasing the correct textbook, as the unit code information listed on Zookal and Booktopia may be incorrect.