Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Radhakrishnan, S. (Sarvepalli)",The principal Upaniṣads,,"George Allen & Unwin,Humanities Press",1953,Muirhead library of philosophy,,"004294046X,0042940478",,https://cir.nii.ac.jp/crid/1130000794756806528