Dainikai Chibetto ryokōki - Kawaguchi, Ekai 1866-1945 (Kōdansha, 1981)
"Nyūzō ki" ni tsuite wa Tōkyō Asahi shinbun Taishō 4-nen 9-gatsu 11-ka - 10-gatsu 4-ka to taishō shita -- p. [20]