MLA

Hughes, Langston, 1902-1967. Cosme, Eusebia. Box 3 (Oversize), folder 37. 1893-1954. https://collections.library.yale.edu/catalog/16195671.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 3 (Oversize), folder 37"])(1893-1954)[Cosme, Eusebia]. https://collections.library.yale.edu/catalog/16195671.