MLA

Van Vechten, Carl, 1880-1964. Guillén, Nicolás, and Langston Hughes. Box 91 | Folder 1588. 1949 March 23. https://collections.library.yale.edu/catalog/2022851.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 91 | Folder 1588"])(1949 March 23)[Guillén, Nicolás, and Langston Hughes]. https://collections.library.yale.edu/catalog/2022851.