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All-Japan Seal Association. (2018). Sensuhyakunen no rekishi wo kizamu gendai no insho [The modern seal which ticks away the history of one thousand several hundred years]. Retrieved July 4, 2018, from All-Japan Seal Association Web site:

http://www.inshou.or.jp/rekishipage/japanpage/nihon5.html

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Darumaya Inbo. (n.d.). Touten, Syokuninn syoukai [Intoroduction of our shop and craftsman]. Retrieved July 6, 2018 from Darumaya Inbo Official Web site: darumaya-inbo.com/guides/intro

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Fukuuoka City Museum. (n.d.). Kinin [Gold Seal]. Retrieved July 6, 2018 from Fukuoka City Museum Web site: http://museum.city.fukuoka.jp/gold/

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Ltd.Kobayashi Daisindou. (2018). Jituin toha? Taisetuna innkan: Jituin ni tuite sirou[What is signs? Important Seal: To learn about signs]. Retrieved July 6, 2018 from Josei ga inkan wo tukuru toki: https://namae.kaiunya.jp/2013/12/jituin/

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Odori,T. (2006) Suisu syounin hansu shuperi no nihonron : inshou ni miru nihon no bunka to syakai [ From the end of 19th century to a European Japanese from to the 20th century: Sealing system "Switzerland merchant Hans, Sporry (1859-1925) of" Japan]. Musashi University Humanities Society