MLA

Hughes, Langston, 1902-1967. Rawson, Richard Dustan. Box 21, folder 296. 1906. https://collections.library.yale.edu/catalog/16207073.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 21, folder 296"])(1906)[Rawson, Richard Dustan]. https://collections.library.yale.edu/catalog/16207073.