MLA

Hughes, Langston, 1902-1967. Nelson, Edward. Box 120, folder 2260. 1941-65. https://collections.library.yale.edu/catalog/32382888.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 120, folder 2260"])(1941-65)[Nelson, Edward]. https://collections.library.yale.edu/catalog/32382888.