Master’s Thesis Abstract: Of chapter 3. The Tohoku Sociological Society.
　　https://web.archive.org/web/20160606062952/http://www.geocities.jp/ptk20120118/20160604/mastersummary/1996tk.jpg
Master’s Thesis Abstract: Of the other chapters. The Literary Society, Tohoku University.
　　https://web.archive.org/web/20160609012744/http://www.geocities.jp/ptk20120118/20160604/mastersummary/1997tk.jpg