Ryūtarō Takahagi

Shichōkaku kizai, kyōzai no at

Shichōkaku kizai, kyōzai no atsukaikata

1973

Kiki riyō no kyōiku kōgaku

Kiki riyō no kyōiku kōgaku

1971

5-nen no shichōkaku kyōiku

5-nen no shichōkaku kyōiku

1958

6-nen no shichōkaku kyōiku

6-nen no shichōkaku kyōiku

1958