Gyeonggi-do Governor. “Report on the arrest of Jehovah’s Witnesses, Worldwide Religious Organization.” Gyeonggi, National Institute of Korean History, 1940.
Inagaka Masami. Japanese Conscientious Objector–Resistance of Deungdaesa During the War. Tokyo-do, Iwanami Bookstore, 1972, p. 111.
Governor-General of Korea. Monthly Government Report of Japan. 79th, Tokyo-do, National Diet Library, 1941.
Gyeonggi-do Police Chief. “A chart mapping the organization of Jehovah’s Witnesses, as appeared in the report.” Gyeonggi, National Institute
Gyeonggi-do Governor. “Report on the arrest of Jehovah’s Witnesses, Worldwide Religious Organization.” Gyeonggi, National Institute of Korean History, 1940.
Home Ministry. Monthly Magazine of Special Higher Police. Tokyo-do, National Diet Library, September 1939.