MLA

Baldwin, James, 1924-1987. Martin, Tom. Box 2, folder 35. 1944. https://collections.library.yale.edu/catalog/2040887.

APA, 6th edition

Baldwin, James, 1924-1987. (["Box 2, folder 35"])(1944)[Martin, Tom]. https://collections.library.yale.edu/catalog/2040887.