Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Mayer, H. E. (Hans Eberhard)",Geschichte der Kreuzzüge,"7., verb. Aufl",Kohlhammer,1989,Kohlhammer Urban-Taschenbücher,,3170107607,,https://cir.nii.ac.jp/crid/1130282271153356160