In Berlin
MLA
Hughes, Langston, 1902-1967. In Berlin. Box 16, folder 180. 1960 October. https://collections.library.yale.edu/catalog/16206971.
APA, 6th edition
Hughes, Langston, 1902-1967. (["Box 16, folder 180"])(1960 October)[In Berlin]. https://collections.library.yale.edu/catalog/16206971.