The UIUC Library has traditionally been very strong in German studies. The collections and resources for German studies are spread across many departmental libraries. The bulk of the printed books are in the Main Stacks accessible on the second floor of the Main Library. The primary libraries for German studies are:
Properly citing sources is part of research. The Library has an excellent guide for Citing Sources
The Library also has guides to popular citation management systems.
You can also Google to find help from the software vendors themselves, such as:
To access Library electronic resources from off-campus, connect through the campus VPN. Follow the instructions on this page: http://techservices.illinois.edu/services/virtual-private-networking-vpn.
Make sure to select TUNNEL ALL and not Split Tunnel.