Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Barnum, H. Gardiner","Market centers and hinterlands in Baden-Württemberg : Marktzentren und Hinterlander in Baden-Württemberg (Deutsche Zusammenfassung, Seite 172)",,"University of Chicago, Dept. of Geography",1966,Research paper,,,,https://cir.nii.ac.jp/crid/1130000795133469312