MLA

Johnson, James Weldon, 1871-1938. Brooks, Gwendolyn. Box 4, folder 59. 1938. https://collections.library.yale.edu/catalog/17234979.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 4, folder 59"])(1938)[Brooks, Gwendolyn]. https://collections.library.yale.edu/catalog/17234979.