Leopold Zahn, Paul Klee, Leben, Werk, Geist (Potsdam, 1920), p. 64 (ill.).
Paul Klee: The Collection of F. C. Schang (South Norwalk, Conn., 1952), no. 4.
Paul Klee: The Collection of F. C. Schang (South Norwalk, Conn., 1953), no. 9, as Friendly Quartet.
Christine Hopfengart, Klee: Von Sonderfall zum Publikumsliebling (Mainz, 1989), p. 41.
Paul Klee Foundation, Paul Klee: Catalogue Raisonné, vol. 2 (Bern, 2000), p. 504, no. 1986 (ill.).
Berlin, Galerie Der Sturm. “Paul Klee, Johannes Molzahn, Kurt Schwitters,” January 1919, cat. 27.
Munich, Galeriestrasse 26, “Neue Münchener Secession,” June 1919.
Munich, Neue Kunst Hans Goltz, “Paul Klee,” May 17-June 25, 1920, cat. 186 (ill.), as Freundliche vier.
Berlin, Galerie Der Sturm, “Paul Klee, Hans Mattis Teutsch, Gesamtschau,” July-August 1921, cat. 16.
Tokyo, Buchhandlung Maruzen, “Expressionism,” June 21-30, 1924, cat. 6/48.
Palm Beach, Fla., Society of the Four Arts, “Paintings by Paul Klee,” March 9-April 1, 1951, cat. 9, as Freundliche vier.
New York, Saidenberg Gallery, “Paul Klee: An Exhibition of Paintings and Drawings Commemorating the 75th Anniversary of his Birth,” March 8-April 26, 1954, cat. 5.
Galerie Neue Kunst Hans Goltz, Munich, about 1919 [Paul Klee Foundation 2000]. Buchholz Gallery, New York [Paul Klee Foundation 2000 and old label now in curatorial file]. Frederick Zimmermann, New York [Paul Klee Foundation 2000]. Frederick C. Schang, South Norwalk, Conn., and New York, by 1951 [Palm Beach, Fl. 1951]. Sold by Saidenberg Gallery, New York, to Clare Hoover, March 1954 [old label]; bequeathed by Clare Hoover Trust to the Art Institute, 1998.
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