MLA

Hughes, Langston, 1902-1967. Perkins, Julius. Box 8 (Oversize), folder 96. 1950. https://collections.library.yale.edu/catalog/16198544.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 8 (Oversize), folder 96"])(1950)[Perkins, Julius]. https://collections.library.yale.edu/catalog/16198544.