MLA

Koch, Frederick R. (Frederick Robinson). Music/The Forsaken Merman. Box 338, folder 1974. 1916. https://collections.library.yale.edu/catalog/2041969.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 338, folder 1974"])(1916)[Music/The Forsaken Merman]. https://collections.library.yale.edu/catalog/2041969.