Richard Bryan McDaniel: Zen Masters of Japan. The Second Step East. Rutland, Vermont: Tuttle Publishing, 2013, s. 317. ISBN ISBN 978-4-8053-1272-8. Heinrich Dumoulin: Zen Buddhism: A History. Japan''. Nowy Jork: Macmillan Publishing Company, 1988, s. 509. ISBN 0-02-908250-1.