MLA

Hughes, Langston, 1902-1967. Kalin, Victor. Box 455, folder 11017. 1960. https://collections.library.yale.edu/catalog/17034163.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 455, folder 11017"])(1960)[Kalin, Victor]. https://collections.library.yale.edu/catalog/17034163.