* 2008, Friday, Karl. "The first samurai: the life and legend of the warrior rebel Taira Masakado", John Wiley & Sons, Inc., Hoboken, New Jersey, ISBN 978-0-471-76082-5.
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* 2008, Friday, Karl. ''The first samurai: the life and legend of the warrior rebel Taira Masakado'', John Wiley & Sons, Inc., Hoboken, New Jersey, ISBN 978-0-471-76082-5.
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* 2006, [u]A User-Friendly Timeline of Ancient Japanese History (with furigana): From the earliest times to 1155[/u], Yoshikawa Kobunkan, ISBN 4-642-01436-5.
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* 2006, ''A User-Friendly Timeline of Ancient Japanese History (with furigana): From the earliest times to 1155'', Yoshikawa Kobunkan, ISBN 4-642-01436-5.