MLA

Hughes, Langston, 1902-1967. Walker, Margaret. Box 167, folder 3055-3056. 1937-66, n.d.. https://collections.library.yale.edu/catalog/17033996.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 167, folder 3055-3056"])(1937-66, n.d.)[Walker, Margaret]. https://collections.library.yale.edu/catalog/17033996.