Cite

Music/Varii capricii, no. 5, alternative version

MLA

Koch, Frederick R. (Frederick Robinson). Music/Varii capricii, no. 5, alternative version. Box 310, folder 1652. n.d.. https://collections.library.yale.edu/catalog/2077420.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 310, folder 1652"])(n.d.)[Music/Varii capricii, no. 5, alternative version]. https://collections.library.yale.edu/catalog/2077420.