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
"Alao, Nurudeen",Christaller central place structures : an introductory statement,,"Dept. of Geography, Northwestern University",1977,Northwestern University studies in geography,,,,https://cir.nii.ac.jp/crid/1130282273357885056