G. Celant, Piero Manzoni Catalogo generale, Milan 1975, no. 12 (another from the edition illustrated, pp. 53 and 212). F. Battino and L. Palazzoli, Piero Manzoni Catalogue raisonné, Milan 1991, no. 1053/12 BM, (another from the edition illustrated, p. 472). G. Celant, Piero Manzoni Catalogo generale, Tomo primo, Milan 2004 (another from the edition illustrated in colour, pp. 291-295). G. Celant, P