Acquired directly from the artist by the present owner
Urs Meile, ed., Ai Weiwei Works 2004-2007, Beijing, 2007, p. 38 (another example illustrated)
Elena Ochoa Foster and Hans Ulrich Obrist, eds., Ways Beyond Art: Ai Weiwei, London, 2009, pp. 52-53 (another example illustrated)
Ai Weiwei According to What?, exh. cat., Mori Art Museum, Tokyo, 2009, p. 14 (another example illustrated)
Ai Weiwei: So Sorry, exh. cat., Haus der Kunst, Munich, 2009, p. 78 (another example illustrated)