Beuys:
Schellmann, Jörg, ed. Joseph Beuys: The Multiples. Munich, New York, Cambridge, 1997.

Kuoni, Carin, ed. Energy Plan for the Western Man: Writings by and Interviews with the Artist. New York, 1990.

Roth:
Rot, Dieter. Collected Works, vol. 20, Books and Graphics (part 1, 1947–1971), and vol. 40, Books and Graphics (part 2, 1971–1979). Stuttgart, London, Reykjavik, 1972/1979.

Graphische Sammlung Albertina. Dieter Roth: Gedrucktes Gepresstes Gebundenes 1949–1979/ Printed Pressed Bound 1949–1979. Cologne, 1998.

Alhäuser:
Junge Kunst e.V. Sonja Alhäuser: Schokoladenmaschinen und Zeichnungen. Wolfsburg, 2000.

Contact: Sies + Höke Galerie, Düsseldorf, Germany.