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Oxford University Press. p. 125. ISBN 978-0-19-533126-4.
Suzuki Kimio,
Shutusdo senka no kenkyû, 202-21. (in ****anese)
Iwahashi Masaru, "Kahei no shinyô"...
- ****anese Coins. New
Generation Publishing. ISBN 0755213653
Suzuki Kimio,
Shutusdo senka no kenkyû, 202-21. (in ****anese)
Iwahashi Masaru, "Kahei no shinyô"...