MLA

Van Vechten, Carl, 1880-1964. Wallace, Emmett Babe. Box 107 | Folder 1949. 1943 January 6. https://collections.library.yale.edu/catalog/2028269.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 107 | Folder 1949"])(1943 January 6)[Wallace, Emmett Babe]. https://collections.library.yale.edu/catalog/2028269.