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2. Ito, Taikichi. "Introduction" (Nihon Chusho Kigyo Gakkai) (1985).
3. Kiyonari, Tadao. "Niju Kozoron no Saiginmi" (A reevaluation of the dual structure thesis), Shoko Kin-yu (Commercial and industrial finance) (November 1973).
4. "Nihon no Chusho Kigyo no ‘Image,’ ‘Jittai,’ to ‘Seisaku’ " (The image, reality, and public policy concerning medium and small firms in Japan), University of Tokyo;Yoshiro Miwa;Keizaigaku Ronshu,1989