Kokuritsu Tokushu Kyōiku Sōgō Kenkyūjo. Chōkaku Gengo Shōgai Kyōiku Kenkyūbu

• Chōkaku shōgai nyūyōji kyōiku no jittai chōsa hōkoku
• Zenkoku nanchō, gengo shōgai gakkyū jittai chōsa hōkokusho
• Zenkoku nanchō, gengo shōgai gakkyū oyobi tsūkyū shidō kyōshitsu jittai chōsa hōkokusho