Ivan Goll, Archipenko, New York, 1920, illustration of the marble version p. 2 Ivan Goll, T. Daubler & Blaise Cendrars, Archipenko Album, Potsdam, 1921, no. I, illustration of another cast on the frontispiece Hans Hildebrandt, Alexander Archipenko, Berlin, 1923, p. 13, illustration of the marble version pl. 20 Albert E. Elsen, Origins of Modern Sculpture: Pioneers and Premises, New York, 1974, pp. 111 & 112, illustration of another cast pl. 132 Katherine Janzsky Michaelsen, Archipenko: A Study of the Early Works, 1908-1920, New York, 1977, p. 34, illustration of another cast pl. 49 Donald Karshan, Archipenko Sculpture, Drawings and Prints 1908-1963, Kentucky, 1985, nos. 26a-c, p. 58, illustrations of the variants pp. 74 & 75 Anette Barth, Alexander Archipenkos plastisches uvre, Frankfurt am Main, 1997, vol. II, no. 59, illustration of the marble p. 137