MLA

Hughes, Langston, 1902-1967. Lachatañeré, Rómulo. Box 100, folder 1873. 1938. https://collections.library.yale.edu/catalog/17020429.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 100, folder 1873"])(1938)[Lachatañeré, Rómulo]. https://collections.library.yale.edu/catalog/17020429.