Vollmeier, P. & Mancini, V., Storia postale del Regno di Napoli pronto origini al introducione del francobollo. Castagnola, 1996. The large postal history and stamp factory to the pre-philately Neapels in 3 volumes, total 1490 S., with innumerable illustrations and with valuations, complete linen with bookjacket in addition to it the introduction booklet in German / English, complete with slipcase (damaged).