MLA

Huntington, Ellsworth, 1876-1947. F. Box 1, folder 7. 1947, undated. https://collections.library.yale.edu/catalog/32507058.

APA, 6th edition

Huntington, Ellsworth, 1876-1947. (["Box 1, folder 7"])(1947, undated)[F]. https://collections.library.yale.edu/catalog/32507058.