Rainer Crone and Wilfred Wiegand, Die revolutionäre Ãsthetik: Andy Warholâs, Darmstadt, 1972, no. 41a, illustrated in color ; Gian Enzo Sperone, Jim Dine, Roy Lichtenstein, Morris Louis, Michelangelo Pistoletto, Robert Rauschenberg, Mario Schifano, Frank Stella, Cy Twombly, Andy Warhol, Turin, 1975, n.p., illustrated in color ; Rainer Crone, Das Bildnerische Werk Andy Warhols, Berlin, 1976, no. 44 ; Carter Ratcliff, Andy Warhol, New York, 1983, no. 30, p. 35, illustrated ; Exh. Cat., London, Anthony dâOffay Gallery, Andy Warhol Portraits, 1993, fig.4, p. 19, illustrated; Lothar Romain, Andy Warhol, Munich, 1993, cat. no. 71, p. 93, illustrated in color; Georg Frei and Neil Printz, The Andy Warhol Catalogue Raisonne: Paintings and Sculpture 1961-1963, vol. 01, New York, 2002, cat. no. 240, p. 218, illustrated in color; Steve Bluttal, ed., introduction by Dave Hickey, Andy Warhol: "Giant" Size, London and New York, 2006, p. 180, illustrated in color