<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Schmidt, Johannes F.K. (2018)</hi>: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">"Niklas Luhmann´s Card Index: Thinking Tool, Communication Partner, Publication Machine"</hi>, in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Alberto Cevolini (ed.)</hi>: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Forgetting Machines. Knowledge Management Evolution in Early Modern Europe</hi>. Leiden: Brill, 289-311.