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. 272 (5259): 246—249. Bibcode:1996Sci...272..246H. S2CID176767223. doi:10.1126/science.272.5259.246.
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. 272 (5259): 246—249. Bibcode:1996Sci...272..246H. S2CID176767223. doi:10.1126/science.272.5259.246.
Johnson, MD PhD, Larry E., ур. (2008). „Copper”. Merck Manual Home Health Handbook. Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc. Архивирано из оригинала 7. 3. 2016. г. Приступљено 7. 4. 2013.
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. 272 (5259): 246—249. Bibcode:1996Sci...272..246H. S2CID176767223. doi:10.1126/science.272.5259.246.
Johnson, MD PhD, Larry E., ур. (2008). „Copper”. Merck Manual Home Health Handbook. Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc. Архивирано из оригинала 7. 3. 2016. г. Приступљено 7. 4. 2013.