MLA

Koch, Frederick R. (Frederick Robinson). Music/Robinson Crusoé. Box 329, folder 1846. n.d.. https://collections.library.yale.edu/catalog/12218314.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 329, folder 1846"])(n.d.)[Music/Robinson Crusoé]. https://collections.library.yale.edu/catalog/12218314.