In 2001 his book Nankin Jiken no Tankyū: Sono Jitsuzō wo Motomete was published by Bungeishunju, later translated into English as The Politics of Nanjing: An Impartial Investigation.
Kitamura cites "A Biographical Dictionary of Foreigners in China in the Modern Age" written in 1981 by the Chinese Social Sciences Publishing Co., which states that "in 1937, after the Marco Polo Bridge Incident, the KMT dispatched [Timperley] to Europe and the United States to engage in propaganda activities", as well as the memoirs of Zeng Xubai, the head of the Kuomintang Central Information Department, who is quoted by Wang Lingxiao, the author of "The KMT's News Administration Policy", as saying, "we decided that our first step would be to make payment to Timperley, and also, through his coordination, to Smythe, and commission both of them to write and publish two books for us as witnesses to the Nanking Massacre".
[5] The August 2, 2002, edition of Shūkan Kin'yōbi presented the criticisms and negative opinions of Hisashi Inoue, Bob Tadashi Wakabayashi, Haruki Watanabe, and of Tokushi Kasahara, who labelled Kitamura as a "denier of the Nanjing Massacre".
[6] Hisashi Watanabe criticized Kitamura's thesis in the official bulletin of the Association of Returnees from China, acknowledging problems with the testimony of Zeng Xubai who, for instance, mistakenly reminisced that Timperley was present in Japanese-occupied Nanjing, and also suggesting that Zeng Xubai did not explicitly state a working relationship between Timperley and the KMT Central Information Department, which was only Wang Lingxiao's interpretation.
"[8] Based on the essays written by Watanabe and Inoue, in 2007 Tokushi Kasahara concluded that "The autobiography of Zeng Xubai is self-serving and unreliable",[9] and he furthermore pointed to Kitamura's greatest "trick" as his attempt to make his readers think that Timperley wrote the 1938 volume "What War Means" as a Chinese spy before he had actually become a KMT agent in 1939.
[10] Kitamura's book Daiichiji Kokkyōgassaku no Kenkyū: Gendai Chūgoku wo Keisei Shita Nidai Seiryoku no Shutsugen ("Research on the First United Front: The Emergence of the Two Great Powers that Constitute Modern China") was published by Iwanami Shoten in 1998.