MLA

Van Vechten, Carl, 1880-1964. Lucioni, Luigi. Box 362, folder 5010. 1939 February 19. https://collections.library.yale.edu/catalog/2056590.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 362, folder 5010"])(1939 February 19)[Lucioni, Luigi]. https://collections.library.yale.edu/catalog/2056590.