Düren, Leopold Hoesch Museum. Foto: Aachen, Peter Hinschläger
Photograph Courtesy of Sotheby's, Inc. © 2002
Courtesy Thomas Ammann Fine Art AG
Leipzig, Museum der bildenden Künste
akg-images 442531
Courtesy Hauser & Wirth Collection Services
Saint Louis Art Museum, Bequest of Morton D. May 867:1983