MLA

Koch, Frederick R. (Frederick Robinson). Music/Minuit amène le mystère. Box 329, folder 1840. n.d.. https://collections.library.yale.edu/catalog/12218309.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 329, folder 1840"])(n.d.)[Music/Minuit amène le mystère]. https://collections.library.yale.edu/catalog/12218309.