Yōji, jidō, seito no gakkōgai katsudō jittai chōsa hōkokusho
Subtitle: Monbushō ishoku chōsa : Heisei 5-nen 6-gatsu chōsa
Publisher: Seishōnen Kyōiku Katsudō Kenkyūkai
Published: 1993
Place of publication: Chiba-ken Abiko-shi
Language: jpn
Number of pages: 139