MLA

Hughes, Langston, 1902-1967. Childress, Alice. Box 51. circa 1920-1993. https://collections.library.yale.edu/catalog/11707205.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 51"])(circa 1920-1993)[Childress, Alice]. https://collections.library.yale.edu/catalog/11707205.