Retrieved 2014-05-27. ↑ A History of Metallography by Cyril Smith - The MIT Press 1960 Page 53-54 ↑ Iron and Steel in Ancient Times By Vagn Fabritius Buchwald -- Det Kongelige Danske Videnskabernes Selskab 2005 Page 65 1 2 Globalizing the Prehistory of Japan: Language, Genes and Civilization, Volume 6 of Routledge Studies in the Early History of Asia, Author Ann Kumar, Publisher Taylor & Francis US, 2009, ISBN 0710313136, 9780710313133 P.23 ↑ , By the Sword: A History of Gladiators, Musketeers, Samurai, Swashbucklers, and Olympic Champions, Author Richard Cohen, Publisher Random House Digital, Inc., 2003ISBN 0812969669, 9780812969665 P.124 ↑ Tàijí Jiàn 32-Posture Sword Form, Author James Drewe, Publisher Singing Dragon, 2009, ISBN 1848190115, 9781848190115 P.10 ↑ The Craft of the Japanese SwordAuthors Leon Kapp, Hiroko Kapp, Yoshindo Yoshihara, Publisher Kodansha International, 1987, ISBN 087011798X, 9780870117985 p.31 1 2 A History of Metallography By Cyril Smith -- The MIT Press 1960 Page 40--57 ↑ "NOVA | Secrets of the Samurai Sword". pbs.org. Retrieved 2014-05-27. ↑ "Hitachi Metals>Tale of tatara>Tama-hagane and the Japanese sword". hitachi-metals.co.jp. Retrieved 2014-05-27. ↑ Metallography and Microstructure in Ancient and Historic Metals by David A. Scott -- The J Paul Getty Trust 1991 Page 29 ↑ "Seminar on Japanese swords". docstoc.com.