1. Hikikomori kara no tabidachi (Leaving from Hikikomori);Tomita,1992
2. Social Withdrawal: Adolescence without End;Saitō,2012
3. Taikyaku shinkeisho to iu shinkategorii no teisho [Propositionof a new category called retreat neurosis];Kasahara,1978
4. La claustration;Gayral;Ann Med Psychol,1953
5. A new form of Social Withdrawal in Japan a review of Hikikomori;Teo;Int J Soc Psychiatry,2010