MLA

Hughes, Langston, 1902-1967. Canada: postcards and note. Box 481, folder 12144. 1958. https://collections.library.yale.edu/catalog/17034176.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 481, folder 12144"])(1958)[Canada: postcards and note]. https://collections.library.yale.edu/catalog/17034176.