MLA

Ford, Charles Henri, 1908-2002. Williams, William Carlos, "The Genius of France": typescript. Box 5, folder 326. n.d.. https://collections.library.yale.edu/catalog/17124870.

APA, 6th edition

Ford, Charles Henri, 1908-2002. (["Box 5, folder 326"])(n.d.)[Williams, William Carlos, "The Genius of France": typescript]. https://collections.library.yale.edu/catalog/17124870.