Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ogawa Kana and Yasuda Shigeru,Study on the Effect of Certification Systems of Organic Products for Activation of Rural District,神戸大学農学部研究報告,0452-2370,神戸大学農学部,1997-01-30,22,2,83-95,https://cir.nii.ac.jp/crid/1390572174882803200,https://doi.org/10.24546/00178073