المصادر : https://en.m.wikipedia.org/wiki/Yukio_Yamaji https://bunshun.jp/articles/-/48045?page=1 http://www.murderpedia.org/male.Y/y/yamaji-yukio.htm https://japantoday.com/category/features/kuchikomi/silent-execution-of-osaka-sisters-killer https://www.kabbos.com/يوكيو-ياماجي-كيف-تصنع-وحشا/