b'Provenance Nathan Cummings New YorkPrivate CollectionLiteratureCarlo L. Ragghianti, Sorel Etrog, Florence, 1968, no. 15, illustration of another cast n.p.Pierre Restany, Sorel Etrog, Munich, 2001, illustration of another cast p. 73Etrog (exhibition catalogue), Gallery Moos, Felix Landau Gallery & Galerie Dresdnere, Toronto, Los Angeles, Montreal, illustration of the study to the work p. 7 William J. Withrow and Sir Philip Hendy, Sorel Etrog, Toronto, 1967 illustration of another version p. 44Ihor Holubizky, Ed., Sorel Etrog Five Decades (exhibition catalogue), Art Gallery of Ontario, Toronto, illustration of another version p. 35Pierre Restany, Sorel Etrog, New York, 2001, illustration of another cast p.73Another cast is in the collection of the Art Gallery of Ontario Sun Bird II 1962-64 in situ in the courtyard at Miriam Shiell Fine Art bronze, 91x 41 x 29 in. | 233 x 104 x 73.6 cm Signed: Etrog 2/5 Fond. R. Michelucci/Pistoia on top of base 9'