"Table 10.1 Registered Foreigners by Nationality: 1950-2006"(PDF). Ministry of Justice, . Annual Report of Statistics on Legal Migrants. National Institute of Population and Social Security Research. 2008. Diakses tanggal December 11, 2012.
平成19年末現在における外国人登録者統計について [Regarding statistics on registered foreigners as at the end of 2007] (PDF) (dalam bahasa Jepang). Japan: Japanese Ministry of Justice. June 2008. Diarsipkan dari versi asli(PDF) tanggal June 24, 2008.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Mitarai, Shoji (10 October 2004), An Exploration of the History of Cross-cultural Negotiation: The First U.S.-Japan Trade Negotiation before Commodore Perry's Arrival, Working Papers, Social Science Research Network, SSRN602701
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平成19年末現在における外国人登録者統計について [Regarding statistics on registered foreigners as at the end of 2007] (PDF) (dalam bahasa Jepang). Japan: Japanese Ministry of Justice. June 2008. Diarsipkan dari versi asli(PDF) tanggal June 24, 2008.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)