Jien,The Future and the Past A Translation and Study of the Gukanshō, an Interpretative History of Japan Written in 1219 (em inglês) University of California Press, 1979 p. 325 ISBN 9780520034600
Hakuseki Arai, Joyce Irene Ackroyd, Lessons from history: the Tokushi Yoron (em inglês) University of Queensland Press, 1982 p. 377 nota 49. ISBN 9780702214851
