↑ The 20th-Century art book (Reprinted. ed.). dsdLondon: Phaidon Press. 2001. ISBN978-0714835426.
↑ Arnason; Harvard, H.; Mansfield, Elizabeth (December 2012). History of Modern Art: Painting, Sculpture, Architecture, Photography (Seventh ed.). Pearson. p. 189. ISBN978-0205259472.