Begin your search in our Katalog plus, where you can search for media housed in or licenced by the libraries attached to the University under "Books & more".
A search under "Articles & more" lets you search other information sources.
A search for media to be found only in the University Library or only in the Institute and Faculty Libraries can be performed using the Red catalogue. Other than the Katalog plus, you only have to login once if you want to order multiple items from the closed stacks. In this catalogue, you can also access your library account.
There are other catalogues that might be interesting for your search: