Cite

Music/Sonatas, piano

MLA

Koch, Frederick R. (Frederick Robinson). Music/Sonatas, piano. Box 344, folder 2034. n.d.. https://collections.library.yale.edu/catalog/2043674.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 344, folder 2034"])(n.d.)[Music/Sonatas, piano]. https://collections.library.yale.edu/catalog/2043674.