MLA

Hughes, Langston, 1902-1967. Roumain, Jacques. Box 138, folder 2589. 1931-46. https://collections.library.yale.edu/catalog/17020457.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 138, folder 2589"])(1931-46)[Roumain, Jacques]. https://collections.library.yale.edu/catalog/17020457.