MLA

Johnson, James Weldon, 1871-1938. "Anti-Lynching Petition to President Roosevelt". Box 88, folder 704. circa 1935-1937. https://collections.library.yale.edu/catalog/15640487.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 88, folder 704"])(circa 1935-1937)["Anti-Lynching Petition to President Roosevelt"]. https://collections.library.yale.edu/catalog/15640487.