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 "Behrens, Sven",Physical environment and its significance for economic development : with special reference to Ethiopia,,"Royal University of Lund, Dept. of Geography : C.W.K. Gleerup",1971,Lund studies in geography,,,,https://cir.nii.ac.jp/crid/1130282271869303808