Rōdō Sōgi Chōsakai
Chūshō kigyō no sōgi- Kagaku kyōkyō no sōgi to kumiai undō
- Kankō sōgi ni tomonau hōritsu mondai
- Kankōrō no sōgi
- Kokutetsu sōgi
- Rōdō kyōyaku o meguru rōshi funsō
- Rokku auto no kenkyū
- Rōshi kankei ni kansuru chihōteki sho mondai
- Rōshi kankei ni okeru kihon mondai
- Sekitan sōgi
- Sengo rōdo sōgi jittai chōsa
- Senʼi rōdō sōgi to kumiai undō