Yoshi S. Kuno: Japanese Expansion on the Asiatic Continent. A Study in the History of Japan with special Reference to her international Relations with China, Korea and Russia. Volume I. University of California Press, Berkeley 1937, S.212–214 (eingeschränkte Vorschau in der Google-Buchsuche).
Christopher Seeley: A History of Writing in Japan (= Brill's Japanese Studies Library. Band3). E. J. Brill, Leiden u. a. 1990, ISBN 90-04-09081-9, S.6 (eingeschränkte Vorschau in der Google-Buchsuche).
