Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 278-279; Varley, H. Paul. (1980). Jinnō Shōtōki. pp. 294-298; Nussbaum, Louis-Frédéric et al. (2005). "Jōwa" in Japan encyclopedia, p. 434; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, seeDeutsche Nationalbibliothek Authority File.
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Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 278-279; Varley, H. Paul. (1980). Jinnō Shōtōki. pp. 294-298; Nussbaum, Louis-Frédéric et al. (2005). "Jōwa" in Japan encyclopedia, p. 434; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, seeDeutsche Nationalbibliothek Authority File.