Cf. G. M. A. Richter, The Portraits of the Greeks, London, 1965, pp. 50-52 and Oxford, 1984 (abridged), pp. 146-148 for the type, including two in the Capitoline Museum (pl. 107) and one in the British Museum (pl. 108); B. S. Ridgway et al, Greek Sculpture in the Art Museum, Princeton University, Princeton, 1994, pp. 93-95, no. 29; R.R.R. Smith, Hellenistic Sculpture, London, 1991, p. 37, pl. 35 (Naples 6023); and M. B. Comstock and C. C. Vermeule, Sculpture in Stone, The Museum of Fine Arts, Boston, 1976, p. 75, no. 119.