MLA

Hughes, Langston, 1902-1967. Richardson, Larry. Box 136, folder 2540. 1949-67. https://collections.library.yale.edu/catalog/32469103.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 136, folder 2540"])(1949-67)[Richardson, Larry]. https://collections.library.yale.edu/catalog/32469103.