Catanuto, NSc 1932, pp. 387-92 (= N. 277 including intrusive items), Kraay, SNR 1970, pp. 69-71 (for details of N. 506, and for the common source of N. 277 and 506)
Gabrici, RIN 1894, pp. 415-7; 1895, p. 30, Gutmann-Schwabacher, MitBayNumGes 1929, pp.101 ff., Kraay, Greek Coins and History (London, 1969), pp. 32-4, Seltmann, ZfN 1895, pp. 165-82, illus.
Evans, NC 1894, pp. 201-16, illus., Herzfelder, Rhegion, pp. 47-8, Jenkins, Gela, pp. 66-7, 160, Kraay, Greek Coins and History (London, 1969), pp. 35-7