MLA

Rogers, James Gamble, 1867-1947. Graduate School. Box 13, folder 48. [ca. 1932]. https://collections.library.yale.edu/catalog/10009184.

APA, 6th edition

Rogers, James Gamble, 1867-1947. (["Box 13, folder 48"])([ca. 1932])[Graduate School]. https://collections.library.yale.edu/catalog/10009184.