Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Märtl, Claudia",Die 101 wichtigsten Fragen : Mittelalter,3. Aufl,C.H. Beck,2009,Beck'sche Reihe,,9783406596216,,https://cir.nii.ac.jp/crid/1130282271349597440