MLA

Koch, Frederick R. (Frederick Robinson). Music/Les Géorgiennes. Box 280, folder 1622. n.d.. https://collections.library.yale.edu/catalog/12244111.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 280, folder 1622"])(n.d.)[Music/Les Géorgiennes]. https://collections.library.yale.edu/catalog/12244111.