MLA

Johnson, James Weldon, 1871-1938. Locke, Alain LeRoy. Box 13, folder 297. 1934-37. https://collections.library.yale.edu/catalog/31919306.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 13, folder 297"])(1934-37)[Locke, Alain LeRoy]. https://collections.library.yale.edu/catalog/31919306.