ISBN 9784902385632 books & textbook
Ijime no rensa o tatsu : Anata mo dekiru ijime bōshi puroguramu
Masumi Sunakawa; Itsuki Hirooka; Ayako Hirooka; Yoshiko Inagaki
Tōkyō : Fuzanbō Intānashonaru, 2008. /2008-11-01 Tankobon Hardcover
isbn-10: 4902385635 / isbn-13: 9784902385632
