著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Oppen, M. von",Agricultural marketing and aggregate productivity : a dimension to be added to agricultural market research,,International Crops Research Institute for the Semi-Arid Tropics,1978,Economics program,,,,https://cir.nii.ac.jp/crid/1130000794712761472