MLA

White, Walter, 1893-1955. Chesnutt, Charles Waddell. Box 1, folder 37. 1930 March 1. https://collections.library.yale.edu/catalog/16612659.

APA, 6th edition

White, Walter, 1893-1955. (["Box 1, folder 37"])(1930 March 1)[Chesnutt, Charles Waddell]. https://collections.library.yale.edu/catalog/16612659.