This page focuses on subject information specific to postgraduates, but also points to other useful pages.
If you need an item which is not available anywhere in the library system in print or online, you can use the Inter-Library Loans service to obtain it from another library. There is a charge for this service, though you may be able to obtain an Inter-library loan voucher to pay for this. Vouchers are generally available in your department and your supervisor will direct you to the person from whom you can obtain one.