MLA

Hughes, Langston, 1902-1967. Amram, David. Box 7, folder 153. 1965-66, n.d.. https://collections.library.yale.edu/catalog/32585227.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 7, folder 153"])(1965-66, n.d.)[Amram, David]. https://collections.library.yale.edu/catalog/32585227.