MLA

Koch, Frederick R. (Frederick Robinson). Music/The Bear. Box 336, folder 1950. [1965-67]. https://collections.library.yale.edu/catalog/2066417.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 336, folder 1950"])([1965-67])[Music/The Bear]. https://collections.library.yale.edu/catalog/2066417.