Düren, Leopold Hoesch Museum. Foto: Aachen, Peter Hinschläger
Photograph Courtesy of Sotheby's, Inc. © 2002
Hamburger Kunsthalle. Foto: Elke Walford
Christie's Images Ltd / ARTOTHEK
Courtesy Hauser & Wirth Collection Services
Saint Louis Art Museum, Bequest of Morton D. May 867:1983