MLA

Hughes, Langston, 1902-1967. Taggard, Genevieve. Box 154, folder 2848. 1938-47, n.d.. https://collections.library.yale.edu/catalog/17020473.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 154, folder 2848"])(1938-47, n.d.)[Taggard, Genevieve]. https://collections.library.yale.edu/catalog/17020473.