‘This final version …’: It wasn’t; Nude Descending a Staircase, No. 3 (watercolour over a photographic base) followed, in 1916: Anne D’Harnoncourt and Kynaston L. McShine (eds.), Duchamp, p. 256
‘only a rough sketch …’: ibid., p. 256
‘a repetition of schematic lines …’: Calvin Tomkins, Duchamp: A Biography, p. 73
‘the anatomical nude …’: D’Harnoncourt and McShine (eds.), Duchamp, p. 256
‘vilains’ (stunning): Guillaume Apollinaire in L’Intransigeant, 19 March 1910, in Guillaume Apollinaire, Marcel Duchamp, 1910–1918, p. 11
‘we are still living under …’: André Breton, Manifesto of Surrealism, in Alex Danchev (ed.), 100 Artists’ Manifestos. From the Futurists to the Stuckists, p. 243