MLA

Johnson, James Weldon, 1871-1938. Working draft, holograph, corrected, signed. Box 50, folder 115-116. before 1912. https://collections.library.yale.edu/catalog/2036331.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 50, folder 115-116"])(before 1912)[Working draft, holograph, corrected, signed]. https://collections.library.yale.edu/catalog/2036331.