MLA

Koch, Frederick R. (Frederick Robinson). Vinès, Ricardo. Box 48, folder 980. [1917 Aug 25]. https://collections.library.yale.edu/catalog/16601851.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 48, folder 980"])([1917 Aug 25])[Vinès, Ricardo]. https://collections.library.yale.edu/catalog/16601851.