George W. PerkinsThe Clear Mirro: A Chronicle of the Japanese Court During the Kamakura Period (1185-1333) (em inglês) Stanford University Press p. 67 ISBN 9780804763882
Jien, Delmer Myers BrownThe Future and the Past: A Translation and Study of the Gukanshō. (em inglês) University of California Press, 1979 p. 194-195 ISBN 9780520034600