Naum Gabo (1937) 'Editorial', p. 7 as cited in: W. Rotzler (1989) Constructive Concepts - A History of Constructive Art from Cubism to the Present, Rizzoli. 
1936 - 1977, Circle: International Survey of Constructive Art, 1937
                                    
Naum Gabo: Element
Naum Gabo was Russian sculptor. Explore interesting quotes on element.
                                        
                                        Attributed to Gabo in: Andrew Lambirth (2013) " Finding beauty in junk http://www.spectator.co.uk/arts/exhibitions/8839071/finding-beauty-in-junk/" in: The Spectator 9 February 2013 
1936 - 1977
                                    
                                        
                                        As quoted in: Fred Kleiner (2008) Intl Stdt Edition-Gardner's Art Thru/Ages: Globl Hist. Vol.2, p. 949 
1918 - 1935, Realistic Manifesto, 1920
                                    
                                        
                                        Quote in: Herschel Browning Chipp (1968) Theories of Modern Art. p. 332 
1936 - 1977, Sculpture: Carving and Construction in Space' (1937)
                                    
                                        
                                        Quote of Gabo, as cited in: Simon Wilson (1991), Tate Gallery: An Illustrated Companion, Tate Gallery, London, revised edition. p. 146 
undated