Hugh Plommer & Cecil Stewart , Simpson’s History of Architectural Development, Vol. I Ancient and classical architecture, Londres, Longmans, Green and Co., 1956, p. 284.

… warehouses and granaries of Ostia, the port at the mouth of the Tiber, show imperial efficiency at its highest.How different from these were the poor, private work, turned out by the autonomous cities, the caddis-fly architecture of mixed materials nearly always inferior, that marred the last days of Pompeii, the exedrae and theatres lavished on Greece by her private fairy-godfather,…