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3. Bloomery Iron, Osmund Iron, Finned Iron and Puddled Iron;Buchwald,2003
4. Iron and steel in ancient times, Historisk-filosofiske Skrifter 29. Copenhagen: Det Kongelige Danske Videnskabernes Selskab;Buchwald,2005
5. Yi xian yan xia dou 44 Hao muzang tieqi jin xiang kaocha chubu bao (preliminary metallographic analysis on the iron objects unearthed from the tomb 44 in Yi county);BUIST;Kaogu,1975