Delmer M. Brown , Future and the Past: A Translation and Study of the Gukanshō (em inglês) University of California Press, 1979 p. 68 ISBN 9780520034600
Herbert E. Plutschow Japan's Name Culture: The Significance of Names in a Religious, Political and Social Context (em inglês) Psychology Press, 1995 p. 100 ISBN 9781873410424