MLA

Hughes, Langston, 1902-1967. Watercolors, 3 items. Box 584, folder 13942. 1956, n.d.. https://collections.library.yale.edu/catalog/16729377.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 584, folder 13942"])(1956, n.d.)[Watercolors, 3 items]. https://collections.library.yale.edu/catalog/16729377.