MLA

Hughes, Langston, 1902-1967. Abrahams, Peter. Box 2, folder 17. 1954-63, n.d.. https://collections.library.yale.edu/catalog/32604129.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 2, folder 17"])(1954-63, n.d.)[Abrahams, Peter]. https://collections.library.yale.edu/catalog/32604129.