Paul Klee Foundation, Kunstmuseum Bern (ed.), Paul Klee Catalogue raisonné. 1883-1940, 9 vols., Bern 1998-2003, vol. 5, CR no. 4594 (illustrated in black and white). - Gutekunst & Klipstein, Bern, Kolorierte Schweizer Stiche. Aquarelle und Handzeichnungen. Neuzeitliche Schweizer Graphik. Moderne Graphik., December 5-7, 1940, lot 802 (illustrated). Will Grohmann, Paul Klee , Stuttgart 1954, pp. 275f. Sotheby"s, New York, November 11, 1992, lot 179A (illustrated in color). Villa Grisebach, Berlin, 31st auction, June 4, 1993, lot 33 (illustrated in color). Wolfgang Kersten and Osamu Okuda, Paul Klee Im Zeichen der Teilung, Stuttgart 1995 (illustrated on p. 356). Shelly Cordulack, Navigating Klee, in: Pantheon 56th year 1998, p. 145. Modern Times - Paul Klee in the 1920s. In: Ex. catalog Paul Klee Konstruktion des Geheimnisses, Pinakothek der Moderne, Munich, March 1-June 10, 2018, pp. 146-165, p. 149 note 9. Called up: December 5, 2025 - ca. 19.04 h +/- 20 min.