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WikiPedia: Ritsuryō http://202.231.40.34/jpub/pdf/jr/IJ1508.pdf http://books.google.com/books?id=18oNAAAAIAAJ&dq=n... http://books.google.com/books?id=18oNAAAAIAAJ&pg=P... http://books.google.com/books?id=K1MuAAAAYAAJ&dq=T... http://forums.samurai-archives.com/viewtopic.php?t... http://openlibrary.org/books/OL6961540M/early_inst... http://www.worldcat.org/title/early-institutional-... http://www.worldcat.org/title/nipon-o-dai-itsi-ran... https://web.archive.org/web/20110529220438/http://... https://web.archive.org/web/20150226180044/http://...