Paul Klee Foundation, Paul Klee: Catalogue Raisonné, 6 (Bern, 2001), p. 303, no. 6045 (ill.).
Jay A. Clarke, Stephanie D’Alessandro, Carola Kupfer, Mark Pascale, Virginia Voedisch, “Portfolio,” The Art Institute of Chicago Museum Studies 28, 1 (2002), pp. 97-98, no. 14.
Karl Nierendorf (1889-1947), Cologne, Berlin, and New York [Pau Klee Foundation]. Bequeathed by Elizabeth H. Paepcke to the Art Institute, 1994.
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