Renn, J. Two aspects of a crisis of European culture: Jürgen Renn. Echo : an infrastructure to bring European cultural heritage online ; the foundation papers of a European initiative.(2002).

Renn, Jürgen. "Two Aspects of a Crisis of European Culture: Jürgen Renn." Echo : An Infrastructure to Bring European Cultural Heritage Online ; the Foundation Papers of a European Initiative.(2002) .

Renn, Jürgen. "Two Aspects of a Crisis of European Culture: Jürgen Renn." Echo : An Infrastructure to Bring European Cultural Heritage Online ; the Foundation Papers of a European Initiative.(2002), .