Andreau（英语：Jean Andreau）, Banking and Business in the Roman World, p. 2; Harris, "The Nature of Roman Money," n.p.
J. Rufus Fears（英语：J. Rufus Fears）, "The Theology of Victory at Rome: Approaches and Problem," Aufstieg und Niedergang der römischen Welt II.17.2 (1981), pp. 752 and 824, and in the same volume, "The Cult of Virtues and Roman Imperial Ideology," p. 908.
Jean Andreau（英语：Jean Andreau）, Banking and Business in the Roman World (Cambridge University Press, 1999), p. 2.
W.V. Harris（英语：William V. Harris）, "The Nature of Roman Money," in The Monetary Systems of the Greeks and Romans, n.p.
Craddock, Paul T. (2008): "Mining and Metallurgy", in: Oleson, John Peter（英语：John Peter Oleson） (ed.): The Oxford Handbook of Engineering and Technology in the Classical World, Oxford University Press, ISBN978-0-19-518731-1, p. 108; Sim, David; Ridge, Isabel (2002): Iron for the Eagles. The Iron Industry of Roman Britain, Tempus, Stroud, Gloucestershire, ISBN0-7524-1900-5, p. 23; Healy, John F. (1978): Mining and Metallurgy in the Greek and Roman World, Thames and Hudson, London, ISBN0-500-40035-0, p. 196. Assumes a productive capacity of c. 1.5 kg per capita. Healy, John F. (1978): Mining and Metallurgy in the Greek and Roman World, Thames and Hudson, London, ISBN0-500-40035-0, p. 196
Hong, Sungmin; Candelone, Jean-Pierre; Patterson, Clair C.; Boutron, Claude F. (1996): "History of Ancient Copper Smelting Pollution During Roman and Medieval Times Recorded in Greenland Ice", Science, Vol. 272, No. 5259, pp. 246–249 (366–369); cf. also Wilson, Andrew (2002): "Machines, Power and the Ancient Economy", 羅馬研究期刊（英语：Society_for_the_Promotion_of_Roman_Studies#Work_of_the_society）, Vol. 92, pp. 1–32 (25–29)
Hong, Sungmin; Candelone, Jean-Pierre; Patterson, Clair C.; Boutron, Claude F. (1994): "Greenland Ice Evidence of Hemispheric Lead Pollution Two Millennia Ago by Greek and Roman Civilizations", Science, Vol. 265, No. 5180, pp. 1841–1843; Callataÿ, François de (2005): "The Graeco-Roman Economy in the Super Long-Run: Lead, Copper, and Shipwrecks", Journal of Roman Archaeology, Vol. 18, pp. 361–372 (361–365); Settle, Dorothy M.; Patterson, Clair C. (1980): "Lead in Albacore: Guide to Lead Pollution in Americans", Science, Vol. 207, No. 4436, pp. 1167–1176 (1170f.); cf. also Wilson, Andrew (2002): "Machines, Power and the Ancient Economy", 羅馬研究期刊（英语：Society_for_the_Promotion_of_Roman_Studies#Work_of_the_society）, Vol. 92, pp. 1–32 (25–29)
Patterson, C. C. (1972): "Silver Stocks and Losses in Ancient and Medieval Times", 經濟史評論（英语：The Economic History Review）, Vol. 25, No. 2, pp. 205–235 (228, table 6); Callataÿ, François de (2005): "The Graeco-Roman Economy in the Super Long-Run: Lead, Copper, and Shipwrecks", Journal of Roman Archaeology, Vol. 18, pp. 361–372 (365f.)
Patterson, C. C. (1972): "Silver Stocks and Losses in Ancient and Medieval Times", 經濟史評論（英语：The Economic History Review）, Vol. 25, No. 2, pp. 205–235 (216, table 2); Callataÿ, François de (2005): "The Graeco-Roman Economy in the Super Long-Run: Lead, Copper, and Shipwrecks", Journal of Roman Archaeology, Vol. 18, pp. 361–372 (365f.)
