Bakun, W.H. (2005). «Magnitude and location of historical earthquakes in Japan and implications for the 1855 Ansei Edo earthquake». Journal of Geophysical Research110 (B02304 edición). pp. B02304. Bibcode:2005JGRB..110.2304B. doi:10.1029/2004JB003329.Falta la |url= (ayuda)
Frank Langdon (1973). Japan's Foreign Policy. Vancouver: University of British Columbia Press, pág. 19
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Bakun, W.H. (2005). «Magnitude and location of historical earthquakes in Japan and implications for the 1855 Ansei Edo earthquake». Journal of Geophysical Research110 (B02304 edición). pp. B02304. Bibcode:2005JGRB..110.2304B. doi:10.1029/2004JB003329.Falta la |url= (ayuda)