MLA

Hughes, Langston, 1902-1967. Africa Trip, Nigeria. Box 462, folder 11236. 1960. https://collections.library.yale.edu/catalog/2017009.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 462, folder 11236"])(1960)[Africa Trip, Nigeria]. https://collections.library.yale.edu/catalog/2017009.