Japan. Kōsei Rōdōshō. Seikatsu Eiseika

• Heisei 13-nendo seikatsu eisei kankei eigyō keiei jittai chōsa hōkoku ryokangyō
• Heisei 19-nendo seikatsu eisei kankei eigyō keiei jittai chōsa hōkoku
• Ryokangyō no jittai to keiei kaizen no hōsaku