Townshend, Charles (2011). Terrorism: a very short introduction (2nd ed.). Oxford [u.a.]: Oxford Univ. Press. p. 116. ISBN9780199603947. Retrieved August 7, 2012. (... enough Sarin in Aum's possession to kill over 4 million people).
Mori, Tatsuya (March 24, 2020). "地下鉄サリン25年 オウムと麻原の「死」で日本は救われたか" [Twenty-five years after the subway sarin attack, has Japan been redeemed by Aum and Asahara's death?]. Newsweek Japan (in Japanese). Retrieved July 4, 2020.