Östliche Meditation und Christliche Mystik by Heinrich DumoulinJoseph J. SpaeMN 22:3/4 (1967) pp. 495–96 → jstor.org/stable/2383084ShareKindai buntai hassei no shiteki kenkyū (Historical Study on the Development of Modern Japanese Style) by Yamamoto MasahideNakae Chōmin no kenkyū (Studies on Nakae Chōmin) by Kuwabara Takeo