(en) A tale of flowering fortunes : annals of Japanese aristocratic life in the Heian period, Stanford University Press, , 910 p. (ISBN978-0-8047-1039-8, lire en ligne), p. 822 (notes de William H. McCullough et Helen C. McCullough)
(en) Shuichi Kato (trad. Don Sanderson), A history of Japanese literature : from the Man'yoshu to modern times, Routledge, , 400 p. (ISBN978-1-873410-48-6, lire en ligne), p. 69