MLA

Hughes, Langston, 1902-1967. American Theatre Wing. Box 7, folder 146. 1942-57. https://collections.library.yale.edu/catalog/32585014.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 7, folder 146"])(1942-57)[American Theatre Wing]. https://collections.library.yale.edu/catalog/32585014.