MLA

Johnson, James Weldon, 1871-1938. "El Presidente or The Yellow Peril, A Comic Opera," drafts, typescript and holograph and notes. Box 75, folder 444-446. undated. https://collections.library.yale.edu/catalog/10187163.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 75, folder 444-446"])(undated)["El Presidente or The Yellow Peril, A Comic Opera," drafts, typescript and holograph and notes]. https://collections.library.yale.edu/catalog/10187163.