Bibliography Kaii-Yōkai Denshō Database. International Research Center for Japanese Studies. Retrieved on 2007-05-12. (Summary of excerpt from Warui Yume o Mita Toki (, When You've Had a Bad Dream?) by Keidō Matsushita, published in volume 5 of the journal Shōnai Minzoku (, Shōnai Folk Customs) on June 15, 1957).
Bibliography Kaii-Yōkai Denshō Database International Research Center for Japanese Studies Retrieved on 2007-05-12 (Summary of excerpt from Warui Yume o Mita Toki ( When You've Had a Bad Dream) by Keidō Matsushita published in volume 5 of the journal Shōnai Minzoku ( Shōnai Folk Customs) on June 15 1957)