J. Spurling, ‘On The Move’, New Statesman , 10 December 1976, pp. 848-850. Exhibition catalogue, Elisabeth Frink: Open Air Retrospective , Wakefield, Yorkshire Sculpture Park, 1983, as 'Protomartyn', n.p., no. 14, another cast illustrated. B. Robertson, Elisabeth Frink Catalogue Raisonné , Salisbury, 1984, pp. 13, 114-115, 186, no. 226, another cast illustrated. Exhibition catalogue, Elisabeth Frink: A Celebration , 1993, London, Beaux Arts, exhibition not numbered, another cast illustrated, n.p. S. Gardiner, Frink: The Official Biography of Elisabeth Frink, London, 1998, p. 222, another cast illustrated opposite p. 203. Exhibition catalogue, Frink: Sculpture & Drawings , London, Beaux Arts, 2002, pp. 4, 19, exhibition not numbered, another cast illustrated. A. Ratuszniak (ed.), Elisabeth Frink: Catalogue Raisonné of Sculpture 1947-93 , London, 2014, p. 132, no. FCR255, another cast illustrated