Daitoshi Zeisei Kenkyūkai

• Daitoshi Zeisei Kenkyūkai Heisei 4-nendo, 5-nendo chōsa kenkyū hōkokusho
• Daitoshi Zeisei Kenkyūkai Heisei 7-nendo chōsa kenkyū hōkokusho
• Daitoshi Zeisei Kenkyūkai Heisei 9-nendo chōsa kenkyū hōkokusho