MLA

Hughes, Langston, 1902-1967. Periquet, Fernando. Box 17, folder 209. 1916. https://collections.library.yale.edu/catalog/16792497.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 17, folder 209"])(1916)[Periquet, Fernando]. https://collections.library.yale.edu/catalog/16792497.