«'Attack on Titan' author expresses fears through popular boys' manga». , 20-07-2013. «An incident that occurred soon after his move to Tokyo served as inspiration for the manga. Isayama was working a night job at an Internet cafe, when a customer suddenly grabbed him by the collar. "I felt the fear of meeting a person I can't communicate with." He projects that terror and discomfort through the titans.»
«White-screen.jp» (en japonès). White Screen, 04-12-2013. Arxivat de l'original el December 7, 2013. [Consulta: 7 desembre 2013].
Error: hi ha títol o url, però calen tots dos paràmetres.«» (en japanese). White Screen, 04-12-2013. Arxivat de l'original el 7 desembre 2013. [Consulta: 7 desembre 2013].