MLA

White, Walter, 1893-1955. American Civil Liberties Union correspondence with Roger Baldwin and others. Box 1, folder 4. 1936 May 17, 1949 September 14-December 5. https://collections.library.yale.edu/catalog/16745941.

APA, 6th edition

White, Walter, 1893-1955. (["Box 1, folder 4"])(1936 May 17, 1949 September 14-December 5)[American Civil Liberties Union correspondence with Roger Baldwin and others]. https://collections.library.yale.edu/catalog/16745941.