full text e-book UBR:
campus license for University of Regensburg full text:
campus license for OTH Regensburg full text:
license for Regional State Library of Regensburg e-media IOS Regensburg:
access only within the institute, not in the reading room
5032416
BV040521862
874200544
Luhmann, Niklas: Die Gesellschaft der Gesellschaft