Cite

Music/Die drei Röselein

MLA

Koch, Frederick R. (Frederick Robinson). Music/Die drei Röselein. Box 342, folder 2008. [early 1900s?]. https://collections.library.yale.edu/catalog/2043662.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 342, folder 2008"])([early 1900s?])[Music/Die drei Röselein]. https://collections.library.yale.edu/catalog/2043662.