Cite

Music/Prelude, piano

MLA

Koch, Frederick R. (Frederick Robinson). Music/Prelude, piano. Box 343, folder 2021. n.d.. https://collections.library.yale.edu/catalog/2043668.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 343, folder 2021"])(n.d.)[Music/Prelude, piano]. https://collections.library.yale.edu/catalog/2043668.