Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Beethoven, Ludwig van and Brandenburg, Sieghard",Keßlersches Skizzenbuch,,Beethoven-Haus,1978,Veröffentlichungen des Beethovenhauses in Bonn,,3881880003,,https://cir.nii.ac.jp/crid/1130000797150288640