Avellino, Opuscoli diversi 2 (Naples, 1833), pp. 85, 167, Jenkins, Gela, p. 148, Mommsen, Hist. de la monn. rom. 1 (Paris, 1865), p. 151, Sambon, Recherches, p. 28
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)
AR. Pot hoard: Uncertain count noted in IGCH including 6 [uncertain], which each has been counted as 1. Then, the total count comes to at least 6 coins