MLA

Johnson, James Weldon, 1871-1938. Douglas, Aaron. Box 6, folder 132. 1927-37. https://collections.library.yale.edu/catalog/16747980.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 6, folder 132"])(1927-37)[Douglas, Aaron]. https://collections.library.yale.edu/catalog/16747980.