"Japan's Position in the Coming World Social Revolution," by Sen Katayama, Source: The Communist International, October 1922, No. 18, pp. 270-275 (5,920 words), Written: Mexico-City, Mexico, May 5 1921.
"To the Soldiers of the Japanese Army in Siberia," by Sen Katayama, Source: The Communist Review, July 1922, Vol. 3, No. 3.; Publisher: Communist Party of Great Britain.