Knopf, Christopher, and Edwin H. Knopf
MLA
Van Vechten, Carl, 1880-1964. Knopf, Christopher, and Edwin H. Knopf. Box 357 | Folder 4878. 1939 January 4. https://collections.library.yale.edu/catalog/2055280.
APA, 6th edition
Van Vechten, Carl, 1880-1964. (["Box 357 | Folder 4878"])(1939 January 4)[Knopf, Christopher, and Edwin H. Knopf]. https://collections.library.yale.edu/catalog/2055280.