Jörg Schellmann, Bernd Klüser, Joseph Beuys. Multiples, New York University Press, 1980
Catalogue raisonné, Multiples and Prints, 1965–1980.
This book documents this entire multiple output of German artist Joseph Beuys. In a conversation with the publishers Beuys indicates his intentions and explains his "extended concept of art" through single works.