Cite

Music/La duchesse d'Alba: German version

MLA

Koch, Frederick R. (Frederick Robinson). Music/La duchesse d'Alba: German version. Box 328, folder 1830. n.d.. https://collections.library.yale.edu/catalog/12215310.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 328, folder 1830"])(n.d.)[Music/La duchesse d'Alba: German version]. https://collections.library.yale.edu/catalog/12215310.