Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Petzet, Detta and Petzet, Michael and Geck, Martin and Habel, Heinrich",Die Richard Wagner-Bühne König Ludwigs II. : München Bayreuth,,Prestel-Verlag,1970,Studien zur Kunst des neunzehnten Jahrhunderts,,,,https://cir.nii.ac.jp/crid/1130000797283912320