National Association for the Advancement of Colored People
MLA
Lewis, Sinclair, 1885-1951. National Association for the Advancement of Colored People. Box 48, folder 572. 1941 November 18. https://collections.library.yale.edu/catalog/17116546.
APA, 6th edition
Lewis, Sinclair, 1885-1951. (["Box 48, folder 572"])(1941 November 18)[National Association for the Advancement of Colored People]. https://collections.library.yale.edu/catalog/17116546.