MLA

Hughes, Langston, 1902-1967. Bardolph, Richard. Box 12, folder 271. 1955-60. https://collections.library.yale.edu/catalog/33412985.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 12, folder 271"])(1955-60)[Bardolph, Richard]. https://collections.library.yale.edu/catalog/33412985.