MLA

Lord, James, 1922-2009. Capote, Truman. Box 5, folder 43. 1954 February 16. https://collections.library.yale.edu/catalog/16622481.

APA, 6th edition

Lord, James, 1922-2009. (["Box 5, folder 43"])(1954 February 16)[Capote, Truman]. https://collections.library.yale.edu/catalog/16622481.