https://en.wikipedia.org/wiki/Kiyotaka_Katsuta

https://murderpedia.org/male.K/k/katsuta-kiyotaka.htm

https://gravereviews.com/2020/05/20/kiyotaka-katsuta-firefighter-by-day-killer-by-night/

https://www.executedtoday.com/2013/11/30/2000-kiyotaka-katsuta-japans-most-evil-killer/

https://skdb.fandom.com/wiki/KATSUTA_Kiyotaka

https://apjjf.org/David-McNeill/2953/article