Hiromi SHIMADA 'What is Soka Gakkai?' (After being retouched and corrected, it was published as books such as "Soka Gakkai" by Shincho New Book, "Ability of Soka Gakkai" by Asahi Shimbun, and "Soka Gakkai that becomes a race" by Kodansha).
島田裕巳「創価学会とは何か」（加筆訂正の上、『創価学会』新潮新書、『創価学会の実力』朝日新聞社、『民族化する創価学会』講談社として書籍化）