MLA

Koch, Frederick R. (Frederick Robinson). Other Papers/Photographs of Ravel. Box 332, folder 1892. c1914. https://collections.library.yale.edu/catalog/10678880.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 332, folder 1892"])(c1914)[Other Papers/Photographs of Ravel]. https://collections.library.yale.edu/catalog/10678880.