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jstor.org
Photos, E. (1989). "The Question of Meteoritic versus Smelted Nickel-Rich Iron: Archaeological Evidence and Experimental Results". World Archaeology. 20 (3): 403–421. doi:10.1080/00438243.1989.9980081. JSTOR124562. S2CID5908149.
Photos, E. (1989). "The Question of Meteoritic versus Smelted Nickel-Rich Iron: Archaeological Evidence and Experimental Results". World Archaeology. 20 (3): 403–421. doi:10.1080/00438243.1989.9980081. JSTOR124562. S2CID5908149.
"Manufacturing Program". Centres for Disease Control and Prevention. February 11, 2019. Archived from the original on April 3, 2019. Retrieved March 14, 2019.